Monday, 30 April 2018
15-4-2018 CHOBE RIVER, NAMIBIA - REED (LONG TAILED) CORMORANT (Microcarbo africanus)
The Reed Cormorant, also known as the Long-tailed Cormorant, is a diminutive member of the cormorant family Phalacrocoracidae. With an overall length of 50–55 cm and a wingspan stretching 80–90 cm, this bird presents a predominantly black plumage with a green gloss during the breeding season. Notably, it sports silvery wing coverts, a somewhat elongated tail, and a modest head crest. A distinctive red or yellow patch adorns its face, complemented by a yellow bill.
In breeding attire, the Reed Cormorant is resplendent in its glossy greenish-black plumage. The non-breeding adults and juveniles, however, exhibit a browner hue and a white underbelly. Some southern populations maintain their crest throughout the year. Both sexes are similar in appearance, making them indistinguishable in the field.
The Reed Cormorant is quite adaptable, making its home in a variety of freshwater wetlands and tranquil coastal environments.
This species is widespread and common, inhabiting inland and coastal regions across Sub-Saharan Africa and Madagascar. It is a resident bird, though it may engage in some seasonal movements.
An adept diver, the Reed Cormorant often forages in shallow waters, occasionally diving to impressive depths. It has a predilection for small, slow-moving fish with elongated bodies, such as mormyrids, catfishes, and cichlids, but will also consume soles, frogs, aquatic invertebrates, and occasionally small birds. Prey is typically brought to the surface before consumption.
The Reed Cormorant's nesting habits are quite private, with nests typically concealed by long grasses either in trees or on the ground. Clutches usually consist of two to four eggs.
The Reed Cormorant could potentially be confused with other cormorant species, but its smaller size, long tail, and the coloration of its face patch and bill are distinguishing features.
The diet of the Reed Cormorant is primarily piscivorous, focusing on fish that match its preferred size and shape. However, its diet can be quite varied depending on local availability.
The IUCN Red List categorizes the Reed Cormorant as Least Concern, indicating that, at present, there are no significant threats to its population numbers.
15-4-2018 CHOBE RIVER, NAMIBIA - AFRICAN PIED KINGFISHER (Ceryle rudis ssp rudis)
The pied kingfisher (Ceryle rudis) is a striking water kingfisher, known for its black and white plumage and distinctive crest. It is a medium-sized bird, approximately 25 cm in length, with a white face featuring a black mask and a white supercilium. The male is characterized by a double band across the breast, while the female sports a single, often broken, breast band.
When identifying the pied kingfisher, look for its unique black and white barred pattern and prominent crest. The male's double breast band and the female's single broken band are key differentiators between the sexes. The subspecies vary slightly in size and coloration, with some having larger bills or reduced white in their plumage.
This kingfisher is commonly found perched along the edges of clear lakes and rivers, where it can easily spot and dive for fish.
The pied kingfisher is widely distributed across sub-Saharan Africa and southern Asia, from Turkey to India and China. It is a resident species, with most populations not engaging in long migrations.
The pied kingfisher is often seen bobbing its head and flicking its tail while perched. It is a sociable bird, known to form large roosts at night. Its flight is direct and rapid, sometimes reaching speeds close to 50 km/h.
30-4-2018 BONAIRE, VALENCIA - EURASIAN MAGPIE (Pica pica)
The Eurasian magpie, or common magpie (Pica pica), is a striking bird that graces the northern reaches of the Eurasian continent. It is a member of the crow family, known as corvids, and is part of the "monochrome" magpie group within the Holarctic radiation. The bird is easily recognized by its black and white plumage and long, iridescent tail.
Adult Eurasian magpies measure 44–46 cm in length, with over half of this being the tail. They have a wingspan of 52–62 cm. The head, neck, and breast are glossy black with a metallic sheen of green and violet, while the belly and scapulars are pure white. The wings are black with green or purple gloss, and the primaries have white inner webs. The tail is black with green and reddish-purple gloss. Both sexes have similar plumage, though females are slightly smaller.
The Eurasian magpie favors open countryside with scattered trees, avoiding dense forests and treeless areas. It adapts well to suburban environments, including parks and gardens, and can be found in city centers.
This magpie's range spans temperate Eurasia from the western edges of Portugal and Spain to the eastern limits of the Kamchatka Peninsula.
The Eurasian magpie is known for its intelligence, comparable to that of great apes. It is monogamous, with pairs often remaining together across seasons. They are sedentary, though northern populations may move south in severe weather.
The magpie's call is a distinctive "chac-chac" or a repetitive "chac-chac-chac-chac." Young birds emit a similar call and a high-pitched "Uik Uik," which can resemble a small dog's bark.
Magpies typically breed after their first year. They build large, domed nests in tall trees, laying clutches of five to six pale blue-green eggs, which are incubated for 21–22 days. The chicks are altricial and fledge at around 27 days, with parental care continuing for several weeks.
Omnivorous, the Eurasian magpie's diet includes young birds, eggs, small mammals, insects, carrion, acorns, grain, and other plant matter.
With an extensive range and stable population trends in Europe, the Eurasian magpie is classified by the IUCN as Least Concern. Estimates suggest a total population of 46 to 228 million individuals globally.
15-4-2018 CHOBE RIVER, NAMIBIA - LILAC BREASTED ROLLER (Coracias caudatus)
The lilac-breasted roller (Coracias caudatus) is a member of the roller family, Coraciidae, resplendent in a panoply of pastel hues. This African bird is a sight to behold, with its lilac throat and breast, olive crown to mantle, and cheeks of lilac-rufous. The species is further adorned with long, black tail streamers, which juveniles lack. Unofficially, it is considered the national bird of Kenya.
In the field, the lilac-breasted roller is almost unmistakable. Adults boast a lilac throat that deepens into a darker lilac breast, with an olive crown and mantle. The cheeks and ear coverts are a lilac-rufous. Juveniles and immatures can be identified by their lack of tail streamers and a throat and breast of rufous-tawny with broad diffuse buffy-white streaks. The species is not sexually dimorphic, though males may be slightly larger.
The lilac-breasted roller favors open woodland and savanna, typically avoiding treeless expanses. They are often seen perched high, surveying the landscape for prey.
This species is widely distributed across Southern and Eastern Africa and is a vagrant to the southern Arabian Peninsula. It is most abundant in Kenya and can be found from sea level to elevations of 2,000 meters or more.
Lilac-breasted rollers are usually solitary or found in pairs. They are known for their aggressive defense of their nests against raptors and other birds. During the breeding season, males perform acrobatic flights, swooping and diving while emitting harsh cries.
The call is a harsh, sawing "rak rak rak," typically delivered in flight. The bird often perches to vocalize.
The lilac-breasted roller is likely monogamous, nesting solitarily. Both sexes incubate the clutch of 2–4 eggs. The nest is located in a natural hole in a tree or termite mound, and the young are altricial, becoming fully feathered after 19 days.
Their diet consists of arthropods and small vertebrates, including insects, spiders, scorpions, and small birds. They hunt from perches, swooping down to catch prey on the ground or in the air.
The IUCN lists the lilac-breasted roller as Least Concern, with a stable population size and a large range.
15-4-2018 CHOBE RIVER, NAMIBIA - GREATER KUDU (Tragelaphus Strepsiceros)
The Greater kudu (Tragelaphus strepsiceros) is a woodland antelope found in Africa. Despite occupying such widespread territory, Greater kudus are sparsely populated in most areas due to declining habitat, deforestation, and poaching.
Greater kudus have a narrow body with long legs, and their coats can range from brown/bluish-grey to reddish-brown. They possess between 4 and 12 vertical white stripes along their torso. The head is usually darker in color than the rest of the body and exhibits a small white v-shaped mark that runs between the eyes. Bulls tend to be much larger than cows, and vocalize much more; they also have beards running along their throats and large horns with two and a half twists.
The range of Greater kudu extends from the east in Ethiopia, Tanzania, Eritrea, and Kenya into the south where they are found in Zambia, Angola, Namibia, Botswana, Zimbabwe, and South Africa. Other regions where they occur are the Central African Republic, Chad, the Democratic Republic of the Congo, Djibouti, Malawi, Mozambique, Somalia, Swaziland, and Uganda. These antelopes live in mixed scrub woodlands and bush on abandoned fields and degraded pastures, mopane bush, and acacia in lowlands, hills, and mountains. They will occasionally venture onto plains only if there is a large abundance of bushes but normally avoid such open areas to avoid becoming an easy target for their predators.
Greater kudus are social animals that live in groups within their home areas. Females usually form small groups of 6-10 with their offspring, but sometimes they can form a herd of up to 20 individuals. Male kudus may form small bachelor groups, but they are more commonly found as solitary and widely dispersed individuals. Solitary males will join the group of females and calves only during the mating season. Home ranges of maternal herds can overlap with other maternal herds while home ranges of adult males generally encompass the ranges of two or three female groups. Greater kudus may be active throughout the 24-hour day. During the day, they normally cease to be active and instead seek cover under woodland, especially during hot days. They feed and drink in the early morning and late afternoon, acquiring water from waterholes or roots and bulbs that have high water content. When a herd is threatened by predators, an adult (usually female) will issue a bark to alert the rest of the herd. Greater kudus communicate using many other vocalizations, including low grunts, clucks, humming, and gasping.
Greater kudus are polygynous meaning that one male mates with more than one female. They breed at the end of the rainy season, which can fluctuate slightly according to the region and climate. Before mating, there is a courtship ritual that consists of the male standing in front of the female and often engaging in a neck wrestling. The male then trails the female while issuing a low-pitched call. Gestation takes around 240 days and calving generally starts between February and March, when the grass tends to be at its highest. Females usually bear one calf, although occasionally there may be two. The pregnant female will leave her group to give birth; once she gives birth, the newborn is hidden in vegetation for about 4 to 5 weeks (to avoid predation). After 4 or 5 weeks, the calf will accompany its mother for short periods of time; then by 3 to 4 months of age, it will accompany her at all times. By the time it is 6 months old, the calf is quite independent of its mother. Female Greater kudus reach reproductive maturity at 15-21 months of age while males reach maturity when they are 21-24 months old.
15-4-2018 CHOBE RIVER, NAMIBIA - VIOLET DROPWING DRAGONFLY (Trithemis annulata)
Trithemis annulata, commonly known as the violet dropwing, violet-marked darter, purple-blushed darter, or plum-coloured dropwing, is a species of dragonfly in the family Libellulidae. It is found in most of Africa, the Middle East, and southern Europe. These dragonflies are called dropwings because of their habit of immediately lowering their wings after landing on a perch. Males of this species are violet-red with red veins in the wings, while females are yellow and brown. Both sexes have red eyes.
Trithemis annulata is a robust medium-sized species with a wingspan of 60 mm (2.4 in). The mature male has a dark red head and a yellow labium with a brown central spot. The eyes are red with white spots on the rear edge, and the frons is dark metallic purplish-red. The prothorax is violet with slightly darker longitudinal stripes. The membranous wings have distinctive red veins, the pterostigma is orange-brown, and there is a large orange-brown splash at the base of the hind wings. The abdomen is fairly broad and is pinkish-violet, with purple markings on the top of each segment and blackish markings on the terminal three segments. Females are a similar size to males, but the thorax is brownish, and the abdomen is yellow with dark brown markings. The wings of females lack the red veins of males but have similar orange-brown patches. It is very similar in appearance to the red-veined dropwing (Trithemis arteriosa), but that species has a more slender abdomen and a wedge-shaped black area on either side of the tip of the abdomen.
15-4-2018 CHOBE RIVER, NAMIBIA - SOUTHERN CARMINE BEE-EATER (Merops nubicoides)
The Southern Carmine Bee-eater, known scientifically as Merops nubicoides, is a vibrant avian spectacle. Its plumage is predominantly a rich carmine, with a contrasting blue crown and undertail, creating a striking visual display.
To identify this species, look for its vivid carmine red coloring, which is complemented by a blue crown and undertail. The bird's slender and streamlined body, typical of bee-eaters, aids in its agile flight.
These birds are commonly found in low-altitude river valleys and floodplains. They show a preference for vertical banks, which are essential for their breeding habits, as they tunnel into these banks to create their nests.
The Southern Carmine Bee-eater graces the skies from KwaZulu-Natal and Namibia to Gabon, eastern Democratic Republic of the Congo, and Kenya. It is a migratory bird, breeding in Zimbabwe and Zambia from August to November, then moving to South Africa during the summer months, and finally migrating to Equatorial Africa from March to August.
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This species is highly sociable, often seen in large flocks. They roost communally in trees or reedbeds and disperse widely during the day. Their agility is showcased as they hawk flying insects from perches or even while following large animals or vehicles to catch prey disturbed by these moving entities.
Breeding occurs at the end of a 1 to 2-meter long burrow in an earthen bank, where they lay a clutch of 2 to 5 eggs. These birds are known for their communal nesting habits, often seen digging vertical burrows in the level surface of small salt islands.
Their diet primarily consists of bees and other flying insects. They employ a hunting strategy known as hawking, where they catch insects in flight from a perch. They are also known to follow wildfires and larger animals to feed on insects that are flushed out in such scenarios.
The Southern Carmine Bee-eater is currently listed as Least Concern on the IUCN Red List, indicating that, at present, there are no immediate threats to its population numbers.
15-4-2018 CHOBE RIVER, NAMIBIA - BLACKSMITH LAPWING (Vanellus armatus)
The Blacksmith Lapwing, known scientifically as Vanellus armatus, is a striking bird with a bold pattern of black, grey, and white, which may serve as a warning to predators. Its red eyes are a distinctive feature, shared with only four other lapwing species across the globe. Adorning the wrist joint is a carpal spur, a sharp black protrusion used in defense of their young, with aggressive aerial dives often aimed at the heads of intruders.
When identifying the Blacksmith Lapwing, look for its red eyes and the contrasting pied plumage. The bill and portions of the legs are black, with the legs sometimes showing a white-grey mottling. The sexes appear similar, though females tend to be slightly larger and heavier.
This lapwing species is commonly found in association with wetlands of varying sizes, from expansive marshes to the smallest damp areas caused by spilling water troughs. In South Africa, they are particularly abundant in mesic grassland regions.
The Blacksmith Lapwing is a common sight from Kenya through central Tanzania to southern and southwestern Africa. They have expanded their range in the 20th century, notably establishing a presence in the western Cape region of South Africa since the 1930s.
Partially migratory, the Blacksmith Lapwing does not engage in large-scale, regular migrations. They are known to be aggressive during the breeding season, particularly towards other lapwings or African jacanas entering their territory.
15-4-2018 CHOBE RIVER, BOTSWANA - BLACK CROWNED NIGHT HERON (Nycticorax nycticorax)
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The black-crowned night-heron (Nycticorax nycticorax), or black-capped night-heron, commonly shortened to just night-heron in Eurasia, is a medium-sized heron found throughout a large part of the world, including parts of Europe, Asia, and North and South America. In Australasia it is replaced by the closely related nankeen night-heron (N. caledonicus), with which it has hybridized in the area of contact.
Adults have a black crown and back with the remainder of the body white or grey, red eyes, and short yellow legs. They have pale grey wings and white under parts. Two or three long white plumes, erected in greeting and courtship displays, extend from the back of the head. The sexes are similar in appearance although the males are slightly larger. Black-crowned night-herons do not fit the typical body form of the heron family. They are relatively stocky with shorter bills, legs, and necks than their more familiar cousins, the egrets and "day" herons. Their resting posture is normally somewhat hunched but when hunting they extend their necks and look more like other wading birds.
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Immature birds have dull grey-brown plumage on their heads, wings, and backs, with numerous pale spots. Their underparts are paler and streaked with brown. The young birds have orange eyes and duller yellowish-green legs. They are very noisy birds in their nesting colonies, with calls that are commonly transcribed as quok or woc.
The breeding habitat is fresh and salt-water wetlands throughout much of the world. The subspecies N. n. hoactli breeds in North and South America from Canada as far south as northern Argentina and Chile, N. n. obscurus in southernmost South America, N. n. falklandicus in the Falkland Islands, and the nominate race N. n. nycticorax in Europe, Asia and Africa. Black-crowned night-herons nest in colonies on platforms of sticks in a group of trees, or on the ground in protected locations such as islands or reedbeds. Three to eight eggs are laid.
This heron is migratory in the northernmost part of its range, but otherwise resident (even in the cold Patagonia). The North American population winters in Mexico, the southern United States, Central America, and the West Indies, and the Old World birds winter in tropical Africa and southern Asia.
A colony of the herons has regularly summered at the National Zoo in Washington, D.C. for more than a century. The birds also prominently live year-round in the shores around the San Francisco Bay, with the largest rookery in Oakland. Their ever presence at Oakland's Lake Merritt and throughout the city's downtown area, as well as their resilience to the urban environment and displacement efforts, have led to them being named Oakland's official city bird.
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There are two archaeological specimens of the black-crowned night-heron in Great Britain. The oldest is from the Roman London Wall and the more recent from the Royal Navy's late medieval victualling yards in Greenwich. It appears in the London poulterers' price lists as the Brewe, a bird which was thought to have been the Eurasian whimbrel or glossy ibis, which has now been shown to refer to the black-crowned night-heron, derived from the medieval French Bihoreau. Black-crowned night-heron may have bred in the far wetter and wider landscape of pre-modern Britain. They were certainly imported for the table so the bone specimens themselves do not prove they were part of the British avifauna. In modern times the black-crowned night-heron is a vagrant and feral breeding colonies were established at Edinburgh Zoo from 1950 into the 21st century and at Great Witchingham in Norfolk, where there were 8 pairs in 2003 but breeding was not repeated in 2004 or 2005. A pair of adults were seen with two recently fledged juveniles in Somerset in 2017, which is the first proven breeding record of wild black-crowned night-herons in Great Britain.
These birds stand still at the water's edge and wait to ambush prey, mainly at night or early morning. They primarily eat small fish, leeches, earthworms, mussels, squid, crustaceans (such as crayfish), frogs, other amphibians, aquatic insects, terrestrial insects, lizards, snakes, small mammals (such as rodents), small birds, eggs, carrion, plant material, and garbage and refuse at landfills. They are among the seven heron species observed to engage in bait fishing; luring or distracting fish by tossing edible or inedible buoyant objects into water within their striking range – a rare example of tool use among birds. During the day they rest in trees or bushes. N. n. hoactli is more gregarious outside the breeding season than the nominate race.
Black-crowned Night Herons nest in groups that often include other species, including herons, egrets, and ibises. A breeding Black-crowned Night Heron will brood any chick that is placed in its nest. The herons apparently don't distinguish between their own offspring and nestlings from other parents.
15-4-2018 CHOBE RIVER, BOTSWANA - BARN SWALLOW (Hirundo rustica)
The barn swallow (Hirundo rustica) is a migratory passerine bird, recognized as the most widespread species of swallow in the world. It is a distinctive bird with blue upperparts and a long, deeply forked tail, known for its graceful flight and agile maneuvers. The adult male of the nominate subspecies is 17–19 cm in length, including elongated outer tail feathers, and has a wingspan of 32–34.5 cm. It is adorned with a rufous forehead, chin, and throat, which are set apart from the off-white underparts by a broad dark blue breast band. The outer tail feathers are elongated, contributing to the iconic "swallow tail."
The barn swallow can be identified by its steel blue upperparts, a rufous face, and a dark blue breast band that separates the rufous from the off-white underparts. The deeply forked tail is a key characteristic, with a line of white spots across the upper tail's outer end. Females resemble males but have shorter tail streamers and less glossy blue coloring. Juveniles are browner with paler rufous faces and whiter underparts, lacking the adult's long tail streamers.
The barn swallow favors open country with low vegetation, such as pastures, meadows, and farmland, often near water. It avoids heavily wooded or steep areas and densely built-up locations. The species typically nests in man-made structures like barns and stables, or under bridges and wharves.
This bird has a vast global range, breeding across the Northern Hemisphere and wintering in much of the Southern Hemisphere. Its distribution spans Europe, Asia, Africa, and the Americas.
Barn swallows are semi-colonial and may settle in groups. They exhibit site fidelity, often returning to the same location annually for breeding. The species is known for its aerial insectivory, catching insects in flight with remarkable agility.
The barn swallow communicates with a variety of calls, including a "witt or witt-witt" and a loud "splee-plink" when excited or deterring intruders. Alarm calls include a sharp "siflitt" for terrestrial predators and a "flitt-flitt" for avian predators. The male's song, used for territory defense and mate attraction, consists of a twittering warble followed by a series of musical notes.
Barn swallows are monogamous and often mate for life, with the male arriving first at the breeding grounds to select a nest site. They build cup-shaped mud nests lined with soft materials, frequently in colonies where each pair defends a territory. The female typically lays two to seven spotted white eggs, with the clutch size varying by latitude.
The barn swallow can be confused with other Hirundo species and the welcome swallow in overlapping ranges. However, its red face and blue breast band distinguish it from African species, and it differs from the welcome swallow by its deeply forked tail and white tail spots.
The diet consists mainly of flying insects, which the barn swallow captures in open areas or follows animals and humans to catch disturbed prey. It may also pick insects from water surfaces, walls, and plants. The species drinks and bathes by skimming over water bodies.
The barn swallow is classified as Least Concern by the IUCN, with an extensive range and large global population. While not endangered, local declines may occur due to specific threats, such as habitat loss or pesticide use. However, the species has benefited from human expansion and the availability of nesting sites.
15-4-2018 CHOBE RIVER, BOTSWANA - HIPPOPOTAMUS (Hippopotamus amphibius)
The hippopotamus (Hippopotamus amphibius) is a large semiaquatic mammal native to sub-Saharan Africa. It is one of only two extant species in the family Hippopotamidae, the other being the Pygmy hippopotamus. Its name comes from the ancient Greek for "river horse".
Aside from elephants and rhinos, the hippopotamus is the largest land mammal. It is also the largest extant land artiodactyl. Despite their physical resemblance to pigs and other terrestrial even-toed ungulates, the closest living relatives of the Hippopotamidae are cetaceans (whales, dolphins, porpoises, etc.), from which they diverged about 55 million years ago. Hippos are among the most dangerous animals in the world due to their highly aggressive and unpredictable nature.
Hippos are recognizable for their barrel-shaped torsos, wide-opening mouths with large canine tusks, nearly hairless bodies, pillar-like legs, and large size. The eyes, ears, and nostrils of hippos are placed high on the roof of their skulls. This allows these organs to remain above the surface while the rest of the body is submerged. The hippo's jaw is powered by huge masseter and digastric muscles which give them large, droopy cheeks. The jaw hinge allows the animal to open its mouth at almost 180°. The canines and incisors are used mainly for combat instead of feeding.
15-4-2018 CHOBE RIVER, BOTSWANA - AFRICAN ELEPHANT (Loxodonta africana)
The African bush elephant (Loxodonta africana), also known as the African savanna elephant, is a species of elephant native to sub-Saharan Africa. It is one of three extant elephant species and, along with the African forest elephant, one of two extant species of African elephant. It is the largest living terrestrial animal, with fully grown bulls reaching an average shoulder height of 3.04–3.36 metres (10.0–11.0 ft) and a body mass of 5.2–6.9 tonnes (11,000–15,000 lb); the largest recorded specimen had a shoulder height of 3.96 metres (13.0 ft) and an estimated body mass of 10.4 tonnes (23,000 lb). The African bush elephant is characterised by its long prehensile trunk with two finger-like processes; a convex back; large ears which help reduce body heat; and sturdy tusks that are noticeably curved. The skin is grey with scanty hairs, and bending cracks which support thermoregulation by retaining water.
The African bush elephant inhabits a variety of habitats such as forests, grasslands, woodlands, wetlands and agricultural land. It is a mixed herbivore feeding mostly on grasses, creepers, herbs, leaves, and bark. The average adult consumes about 150 kg (330 lb) of vegetation and 230 L (51 imp gal; 61 US gal) of water each day. A social animal, the African bush elephant often travels in herds composed of cows and their offspring. Adult bulls usually live alone or in small bachelor groups. During the mating season, males go through a process called musth; a period of high testosterone levels and heightened aggression. For females, the menstrual cycle lasts three to four months, and gestation around 22 months, the longest of any mammal.
14-4-2018 CHOBE RIVER, NAMIBIA - NILE CROCODILE (Crocodylus niloticus)
The Nile crocodile (Crocodylus niloticus) is a large crocodilian native to freshwater habitats in Africa, where it is present in 26 countries. It is widely distributed in sub-Saharan Africa, occurring mostly in the eastern, southern, and central regions of the continent, and lives in different types of aquatic environments such as lakes, rivers, swamps and marshlands. It occasionally inhabits deltas, brackish lakes and rarely also saltwater. Its range once stretched from the Nile Delta throughout the Nile River. Lake Turkana in Kenya has one of the largest undisturbed Nile crocodile populations.
Generally, the adult male Nile crocodile is between 3.5 and 5 m (11 ft 6 in and 16 ft 5 in) in length and weighs 225 to 750 kg (496 to 1,653 lb).[5][6] However, specimens exceeding 6.1 m (20 ft) in length and 1,000 kg (2,200 lb) in weight have been recorded. It is the largest predator in Africa, and may be considered the second-largest extant reptile in the world, after the saltwater crocodile (Crocodylus porosus).[8][9] Size is sexually dimorphic, with females usually about 30% smaller than males. The crocodile has thick, scaly, heavily armoured skin.
Nile crocodiles are opportunistic apex predators; a very aggressive crocodile, they are capable of taking almost any animal within their range. They are generalists, taking a variety of prey, with a diet consisting mostly of different species of fish, reptiles, birds, and mammals. As ambush predators, they can wait for hours, days, and even weeks for the suitable moment to attack. They are agile predators and wait for the opportunity for a prey item to come well within attack range. Even swift prey are not immune to attack. Like other crocodiles, Nile crocodiles have a powerful bite that is unique among all animals, and sharp, conical teeth that sink into flesh, allowing a grip that is almost impossible to loosen. They can apply high force for extended periods of time, a great advantage for holding down large prey underwater to drown.
Nile crocodiles are relatively social. They share basking spots and large food sources, such as schools of fish and big carcasses. Their strict hierarchy is determined by size. Large, old males are at the top of this hierarchy and have first access to food and the best basking spots. Crocodiles tend to respect this order; when it is infringed, the results are often violent and sometimes fatal. Like most other reptiles, Nile crocodiles lay eggs; these are guarded by the females but also males, making the Nile crocodiles one of few reptile species whose males contribute to parental care. The hatchlings are also protected for a period of time, but hunt by themselves and are not fed by the parents.
The Nile crocodile is one of the most dangerous species of crocodile and is responsible for hundreds of human deaths every year. It is common and is not endangered, despite some regional declines or extirpations in the Maghreb.
The Nile crocodile's current distribution extends from the regional tributaries of the Nile in Sudan and Lake Nasser in Egypt to the Cunene river in Angola, the Okavango Delta of Botswana, and the Olifants River in South Africa.[64] It is the most common crocodilian in Africa and occurs in Somalia, Ethiopia, Uganda, Kenya, Central African Republic, the Democratic Republic of the Congo, Equatorial Guinea, Tanzania, Rwanda, Burundi, Zambia, Zimbabwe, Gabon, Malawi, Mozambique, Namibia, Sudan, South Sudan and Cameroon.[25] Its historic range extended to the Mediterranean coast in Libya, Tunisia, Algeria, Morocco and across the Red Sea in the Palestine region and Syria. Herodotus sighted it in Lake Moeris in Egypt. It is thought to have become extinct in the Seychelles in the early 19th century. It has rarely been spotted in Zanzibar and the Comoros.
An isolated population also exists in western and southern Madagascar from Sambirano River to Tôlanaro. It likely colonized the island after the extinction of the endemic crocodile Voay within the last 2000 years. In 2022, a skull of Crocodylus from Madagascar was found to be around 7,500 years old based on radiocarbon dating, suggesting that the extinction of Voay post-dates the arrival of Nile crocodiles on Madagascar.
The Nile crocodile was previously thought to also occur in West and Central Africa, but these populations are now typically recognized as a distinct species, the West African (or desert) crocodile. The West African crocodile occurs throughout much of West and Central Africa, ranging east to South Sudan and Uganda where it may come into contact with the Nile crocodile. The Nile crocodile is absent from most of West and Central Africa, but range into the latter region in eastern and southern Democratic Republic of Congo, and along the Central African coastal Atlantic region north to Cameroon. Likely a level of habitat segregation occurs between the two species, but this remains to be confirmed.
Nile crocodiles may be able to tolerate an extremely broad range of habitat types, including small brackish streams, fast-flowing rivers, swamps, dams, and tidal lakes and estuaries. In East Africa, they are found mostly in rivers, lakes, marshes, and dams, favoring open, broad bodies of water over smaller ones. They are often found in waters adjacent to various open habitats such as savanna or even semi-desert but can also acclimate to well-wooded swamps, extensively wooded riparian zones, waterways of other woodlands and the perimeter of forests. In Madagascar, the remnant population of Nile crocodiles has adapted to living within caves. Nile crocodiles may make use of ephemeral watering holes on occasion. The Nile crocodile possesses salt glands like all true crocodiles and does on occasion enter coastal and even marine waters. They have been known to enter the sea in some areas, with one specimen having been recorded 11 km (6.8 mi) off St. Lucia Bay in 1917.
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