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Monday, 18 May 2015

19-3-2015 JURONG, SINGAPORE - LESSER FLAMINGO (Phoeniconaias minor)


The lesser flamingo (Phoeniconaias minor) is a species of flamingo occurring in sub-Saharan Africa and western India. Birds are occasionally reported from further north, but these are generally considered vagrants.

The lesser flamingo is the smallest species of flamingo, though it is a tall and large bird by most standards. The species can weigh from 1.2 to 2.7 kg (2.6 to 6.0 lb).[5] The standing height is around 80 to 90 cm (31 to 35 in). The total length (from beak to tail) and wingspan are in the same range of measurements, from 90 to 105 cm (35 to 41 in). Most of the plumage is pinkish white. The clearest difference between this species and the greater flamingo, the only other Old World species of flamingo, is the much more extensive black on the bill. Size is less helpful to distinguish the two species, unless they occur together, since the sexes of each species also differ in height.

The extinct species Phoeniconaias proeses in the same genus, from the Pliocene of Australia, is thought to have been even smaller.


The lesser flamingo may be the most common species of flamingo, with a population that (at its peak) probably numbered up to two million individual birds. This species feeds primarily on Spirulina, algae which grow only in very alkaline lakes. Presence of flamingo groups near water bodies is an indication of sodic alkaline water which is not suitable for irrigation use. Although blue-green in colour, the algae contain the photosynthetic pigments that give the birds their pink colour. Their deep bill is specially adapted for filtering tiny food items.


Despite being the most common species of flamingo, it is classified as near threatened due to its declining population and the low number of breeding sites, some of which are threatened by human activities.
The population in the two key East African lakes, Nakuru and Bogoria, have been adversely affected in recent years by suspected heavy metal poisoning, while its primary African breeding area in Lake Natron is currently under threat by a proposed soda ash plant by Tata Chemicals. The only breeding site in South Africa, situated at Kamfers Dam, is threatened by pollution and encroaching development.

29-3-2015 KERALA, INDIA - CHEMBALLI DUCK





19-3-2015 JURONG, SINGAPORE - SACRED IBIS (Threskiornis aethiopicus)


The African sacred ibis (Threskiornis aethiopicus ) is a wading bird native to Africa and the Middle East. It is especially known for its role in the religion of the Ancient Egyptians, where it was linked to the god Thoth; despite this, the species is currently extirpated from Egypt.

African sacred ibises have all-white body plumage apart from dark plumes on the rump. Males are generally slightly larger than females.


The bald head and neck, thick curved bill, and legs of these birds are black. The white wings show a black rear border in flight. The eyes are brown with a dark red orbital ring. Sexes are similar, but juveniles have dirty white plumage, a smaller bill and some feathering on the neck, greenish-brown scapular, and more black on the primary coverts.

African sacred ibises breed in Sub-Saharan Africa and southeastern Iraq. A number of populations are migrants with the rains; some of the South African birds migrate 1,500 km as far north as Zambia, and the African birds north of the equator migrate in the opposite direction. The Iraqi population usually migrates to southwestern Iran. African sacred ibises live in marshy wetlands and mud flats, both inland and on the coast. They prefer to nest on trees in or near water and feed in very shallow wetlands or slowly stomp in wet pastures with soft soil. They also visit cultivation and rubbish dumps.


African sacred ibises are very social birds; they nest in big colonies and feed in groups of up to 20 individuals. They wade primarily by day catching aquatic prey in shallow waters or probing into the soil with their long beaks for invertebrates. The birds are usually silent and only occasionally make puppy-like yelping noises.

African sacred ibises are serially monogamous and form pair bonds that last only one breeding season. They usually breed once per year in the wet season; from March to August in Africa, and from April to May in Iraq. The birds nest in tree colonies, often with other large wading birds such as storks, herons, African spoonbills, African darters, and cormorants. They may also form single-species groups on offshore islands or abandoned buildings. Large colonies consist of numerous subcolonies and can number 1000 birds. African sacred ibises build a stick nest, often in a baobab tree but island nests are often made on the ground. Females lay 1 to 5 eggs per season and both parents incubate them for 21 to 29 days. After hatching, one parent continuously stays in the nest for the first 7 days. Chicks fledge after 35 to 40 days and become independent after 44 to 48 days. They become reproductively mature and start to breed 1 to 5 years after hatching.

Saturday, 16 May 2015

16-5-2015 MONTE CORONA, VALENCIA - SPOTTED FLYCATCHER (Muscicapa striata)


More streaked than spotted, this small grey-brown, long-winged flycatcher is a dashing bird of woodland, parks and gardens.

The Spotted Flycatcher is amongst the last of our summer visitors to arrive, often not being seen until late April or even early May. It breeds throughout Britain & Ireland, apart from the very far north and west.

Spotted Flycatchers spend the winter months in Africa and BTO research has shown that some head as far south as Namibia, around 7,000 km from their breeding location. A host of summer migrants are experiencing declines in their breeding populations and the Spotted Flycatcher is one of these. It has been on the UK Red List since 1996.

16-5-2015 EDBRO DELTA, TARRAGONA - EURASIAN CURLEW (Numenius arquata)


The Eurasian curlew or common curlew (Numenius arquata) is a very large wader in the family Scolopacidae. It is one of the most widespread of the curlews, breeding across temperate Europe and Asia. In Europe, this species is often referred to just as the "curlew", and in Scotland known as the "whaup" in Scots.

The curlew exists as a migratory species over most of its range, wintering in Africa, southern Europe and south Asia. Occasionally a vagrant individual reaches places far from its normal range, such as Nova Scotia and the Marianas. It is present all year in the milder climates of Ireland and the United Kingdom and its adjacent European coasts.

Friday, 15 May 2015

15-5-2015 EBRO DELTA, TARRAGONA - BLACK WINGED STILT (Himantopus himantopus)


This graceful long-legged wader used to be a rare passage visitor to Britain, but is now considered a colonising breeder.

With its striking black and white plumage, long bill, and red legs this species evokes the feeling of its Mediterranean home when it is found delicately wading through a lagoon, picking small insects off the water’s surface.


Breeding was first recorded in 1945 (in Nottinghamshire) but we now see a handful of breeding attempts in most years, mostly in southern England, so this species could yet become an established breeder. The reasons for this are unclear, but warming temperatures and improved water quality in our wetlands probably contribute.


15-5-2015 EBRO DELTA, TARRAGONA - SMALL WHITE BUTTERFLY (Pieris rapae)

 


Pieris rapae is a small- to medium-sized butterfly species of the whites-and-yellows family Pieridae. It is known in Europe as the small white, in North America as the cabbage white or cabbage butterfly, on several continents as the small cabbage white, and in New Zealand as the white butterfly. The butterfly is recognizable by its white color with small black dots on its wings, and it can be distinguished from P. brassicae by its larger size and the black band at the tip of its forewings.

The caterpillar of this species, often referred to as the "imported cabbageworm", is a pest to crucifer crops such as cabbage, kale, bok choy and broccoli. Pieris rapae is widespread in Europe and Asia; it is believed to have originated in the Eastern Mediterranean region of Europe, and to have spread across Eurasia thanks to the diversification of brassicaceous crops and the development of human trade routes. Over the past two centuries, it spread to North Africa, North America, New Zealand, and Australia, as a result of accidental introductions.

Tuesday, 12 May 2015

29-3-2015 COCHIN, INDIA - ORIENTAL MAGPIE ROBIN (Copsychus saularis)


The Oriental magpie-robin (Copsychus saularis) is a small passerine bird that was formerly classed as a member of the thrush family Turdidae, but now considered an Old World flycatcher. They are distinctive black and white birds with a long tail that is held upright as they forage on the ground or perch conspicuously. Occurring across most of the Indian subcontinent and parts of Southeast Asia, they are common birds in urban gardens as well as forests. They are particularly well known for their songs and were once popular as cagebirds.

The oriental magpie-robin is considered the national bird of Bangladesh.


This magpie-robin is a resident breeder in tropical southern Asia from Nepal, Bangladesh, India, Sri Lanka and eastern Pakistan, eastern Indonesia, Thailand, south China, Malaysia, and Singapore.

The Oriental magpie-robin is found in open woodland and cultivated areas often close to human habitations.

Magpie-robins breed mainly from March to July in India and January to June in south-east Asia. Males sing from high perches during courtship. The display of the male involves puffing up the feathers, raising the bill, fanning the tail and strutting. They nest in tree hollows or niches in walls or building, often adopting nest boxes. They line the cavity with grass. The female is involved in most of the nest building, which happens about a week before the eggs are laid. Four or five eggs are laid at intervals of 24 hours and these are oval and usually pale blue green with brownish speckles that match the color of hay. The eggs are incubated by the female alone for 8 to 14 days. The nests are said to have a characteristic odour.

11-4-2015 SALALAH, OMAN - HOUSE CROW (Corvus splendens)


The house crow (Corvus splendens), also known as the Indian, greynecked, Ceylon or Colombo crow, is a common bird of the crow family that is of Asian origin but now found in many parts of the world, where they arrived assisted by shipping. It is between the jackdaw and the carrion crow in size (40 cm (16 in) in length) but is slimmer than either. The forehead, crown, throat and upper breast are a richly glossed black, whilst the neck and breast are a lighter grey-brown in colour. The wings, tail and legs are black. There are regional variations in the thickness of the bill and the depth of colour in areas of the plumage.

23-4-2015 ISTANBUL, TURKEY - YELLOW LEGGED GULL (JUVENILE) (Larus michahellis)


The yellow-legged gull (Larus michahellis) is a large gull found in Europe, the Middle East and North Africa, which has only recently achieved wide recognition as a distinct species. It was formerly treated as a subspecies of either the Caspian gull L. cachinnans, or more broadly as a subspecies of the herring gull L. argentatus. The genus name is from Latin Larus which appears to have referred to a gull or other large seabird, and the species name honours the German zoologist Karl Michahelles.


Monday, 11 May 2015

10-5-2015 MONTE CORONA, VALENCIA - MOORISH GECKO (Tarentola mauritanica)


Tarentola mauritanica, known as the common wall gecko, is a species of gecko (Gekkota) native to the western Mediterranean area of North Africa and Europe. It has been introduced to Madeira and Balearic Islands, and the Americas (in Montevideo, Buenos Aires and California). A nocturnal animal with a predominantly insectivorous diet, it is commonly observed on walls in urban environments in warm coastal areas; it can be found further inland, especially in Spain where it has a tradition of cohabitation with humans as an insect hunter. A robust species, up to 15 centimetres (5.9 in) long, its tubercules are enlarged and give the species a spiny armoured appearance.

The species was first described by Carl Linnaeus in 1758. It is also known as moorish gecko, crocodile gecko, European common gecko, and, regionally, as osga (in Portuguese), salamanquesa (in Spanish) and dragó (in Catalan).

Tuesday, 5 May 2015

27-3-2015 GALLE, SRI LANKA - EASTERN CATTLE EGRET (Bubulcus ibis ssp. coromandus)



The eastern cattle egret (Bubulcus coromandus) is a species of heron (family Ardeidae) found in the tropics, subtropics and warm temperate zones. Most taxonomic authorities lump this species and the western cattle egret together as subspecies of the cattle egret, but some (including the International Ornithologists' Union) separate them. Despite the similarities in plumage to the egrets of the genus Egretta, it is more closely related to the herons of Ardea. It is native to southern and eastern Asia, and Australasia.

It is a white bird adorned with buff plumes in the breeding season. It nests in colonies, usually near bodies of water and often with other wading birds. The nest is a platform of sticks in trees or shrubs. Eastern cattle egrets exploit drier and open habitats more than other heron species. Their feeding habitats include seasonally inundated grasslands, pastures, farmlands, wetlands and rice paddies. They often accompany cattle or other large mammals, catching insect and small vertebrate prey disturbed by these animals. Some populations of the cattle egret are migratory and others show post-breeding dispersal.

The adult eastern cattle egret has few predators, but birds or mammals may raid its nests, and chicks may be lost to starvation, calcium deficiency or disturbance from other large birds. This species maintains a special relationship with cattle, which extends to other large grazing mammals; wider human farming is believed to be a major cause of their suddenly expanded range. The cattle egret removes ticks and flies from cattle and consumes them. This benefits both species, but it has been implicated in the spread of tick-borne animal diseases.



19-3-2015 JURONG, SINGAPORE - SUPERB STARLING (Lamprotornis superbus)



The superb starling (Lamprotornis superbus) is a member of the starling family of birds. It was formerly known as Spreo superbus. They are long-lived birds that can live over 15 years in captivity.

This species is 18 to 19 cm (7.1 to 7.5 in) in height. These small short-tailed starlings have a long narrow bill, robust bodies, strong feet and a distinctive plumage pattern. Their spectacular iridescent plumage is due to the arrangement of melanin granules within the feathers, resulting in structural blues and greens, rather than colors derived from pigments. The appearance of the superb starling is very similar to the Hildebrandt's starling, also found in East Africa. The superb starling is distinguished by having pale creamy-white eyes, as opposed to red eyes in the Hildebrandt's. Moreover, only adult superb starlings have a white breast band.


The superb starling lives in the savanna, thornbush and acacia arid areas, open woodland, lakeshore woodlands, gardens and cultivated fields, at an elevation of 0–2,650 metres (0–8,694 ft) above sea level. They tend to avoid humid lowland areas. This species has a very large range and can commonly be found in East Africa, including Ethiopia, Somalia, Uganda, Kenya, South Sudan, and Tanzania. Superb Starlings typically occupy large territories, often exceeding 50 hectares (0.50 km2). When they are not on their territories, they are usually searching for food or heading to water sources. Their group can have more than 40 individuals. The sex ratio in those is approximately equal. In the non-breeding season, being the dry season, the groups of superb starlings live with other starling species such as the Hildebrandt’s starling (Lamprotornis hildebrandti) and the greater blue-eared glossy starling (Lamprotornis chalybaeus). They have also been observed with other bird species such as the red-billed buffalo weaver (Bubalornis niger) and the white-headed buffalo weaver (Dinemellia dinemellii) in the Serengeti National Park, in Tanzania. Mixed species flocks might aid in obtaining food and serve as a defense mechanism against predators. When it is the breeding season however, the superb starlings are territorial and chase the birds of other species from the group, especially when they approach their nests.


9-4-2015 MUSCAT, OMAN - SOOTY GULL (Ichthyaetus hemprichii)


The sooty gull is native to the Red Sea, the Gulf of Aden, the Gulf of Oman, the Persian Gulf and its range extends as far east as Pakistan. It is also native to the east coast of Africa as far south as Tanzania and Mozambique. It occurs as a vagrant in India, Sri Lanka, the Maldives, Jordan, Lebanon, Israel and Bahrain. It is a coastal bird, seldom going further out to sea than about 10 km (6 mi) beyond coastal reefs although it has occasionally been seen 140 km (87 mi) from land. It frequents ports and harbours, the coast, inshore islands and the intertidal zone. It seldom moves inland or visits freshwater locations. It is nomadic or partially migratory and many populations move southwards after breeding, though Red Sea populations seem to be relatively sedentary.


The sooty gull (Ichthyaetus hemprichii) is a species of gull in the family Laridae, also known as the Aden gull or Hemprich's gull. It is found in Bahrain, Djibouti, Egypt, Eritrea, India, Iran, Israel, Jordan, Kenya, Lebanon, Maldives, Mozambique, Oman, Pakistan, Palestine, Qatar, Saudi Arabia, Somalia, Sri Lanka, Sudan, Tanzania, United Arab Emirates, and Yemen. As is the case with many gulls, it has traditionally been placed in the genus Larus. The sooty gull is named in honour of the German naturalist Wilhelm Hemprich who died in 1825 while on a scientific expedition to Egypt and the Middle East with his friend Christian Gottfried Ehrenberg.


The IUCN lists the sooty gull as being of "Least Concern". This is because it has a very wide range and its total population is large. The population trend is believed to be downwards but the rate of decrease is insufficient to warrant listing the bird in a more threatened category. The main threats faced by the bird are from the exploration of some of its traditional breeding grounds for oil, land reclamation, and the possibility of oil spills.

19-3-2015 JURONG, SINGAPORE - RAINBOW LORIKEET (Trichoglossus haematodus)


The rainbow lorikeet (Trichoglossus moluccanus) is a species of parrot found in Australia. It is common along the eastern seaboard, from northern Queensland to South Australia. Its habitat is rainforest, coastal bush and woodland areas. Six taxa traditionally listed as subspecies of the rainbow lorikeet are now treated as separate species (see Taxonomy).

Rainbow lorikeets have been introduced to Perth, Western Australia; Tasmania; Auckland, New Zealand; and Hong Kong.


19-3-2015 JURONG, SINGAPORE - ROSY BILLED POCHARD (MALE) (Netta peposaca)


The rosy-billed pochard (Netta peposaca), alternatively named rosybill or rosybill pochard, is a member of family Anatidae. Though classified as a diving duck, this pochard feeds more like a dabbling duck feeding on seeds roots, sedges, aquatic plants and other grasses. Netta is Ancient Greek for "duck" and peposaca is a transcription of the Guaraní name of this species which means "showy wings", referring to the broad white stripe that is only visible with stretched out wings. Male characteristic features include a bright red bill with a rounded knob at the base.

The rosy-billed pochard is endemic to South America. It is found in Argentina, central Chile, Paraguay, Uruguay and southern Brazil. The population in southern Argentina migrates northward during the austral winter, reaching Brazil and southern Bolivia. It is a vagrant to the Falkland Islands.

Monday, 4 May 2015

4-5-2015 VILLALONGA TUNNELS, VALENCIA - IBERIAN GREEN FROG (Pelophylax perezi)


The Perez's frog (Pelophylax perezi), also known as Iberian waterfrog, Iberian green frog or Coruna frog, is a species of frog in the family Ranidae. It is native to southern France, Portugal, Spain, and has been introduced to the Canary and Balearic Islands, Madeira, the United Kingdom, and the Azores. In the Iberian Peninsula it is widespread and common.

Its natural habitats are temperate forests, temperate shrubland, Mediterranean-type shrubby vegetation, rivers, intermittent rivers, swamps, freshwater lakes, intermittent freshwater lakes, freshwater marshes, intermittent freshwater marshes, sandy shores, arable land, and urban areas. It is not considered threatened by the IUCN.


A medium-sized, stout frog; snout-vent length is usually from 40 to 70 mm, but sometimes is longer than 10 cm (Docampo and Milagrosa-Vega 1988; González de la Vega 1988). The head is as long as wide, with prominent eyes located in dorsal position very close to each other. The tympanum is well marked, about 1/2 to 3/4 the eye diameter (Salvador and García-París 2001). Toes have well developed webbing. Skin is either smooth or slightly rough, with well-formed dorsolateral folds.

The dorsal coloration is very variable, usually green but also brown or grayish to dark gray. They usually show a vertebral stripe, mostly yellow or green. Two irregular rows of dark, rectangular spots are present on both sides of the vertebral stripe. These spots are also present on the rear limbs, sometimes forming a banded pattern. Some individuals lack both the spots and the vertebral stripe. Ventrally they are white with a variable number of dark spots. Males are smaller than females and have stronger forelimbs. They have gray vocal sacs than can be appreciated even when they are not in use.


Tadpoles grow up to 111 mm total length (Salvador 1985), but usually measure between 60-70 mm (Barbadillo et al. 1999). The spiracle is sinistral and the anus open on the right side of the base of the tail. Marginal papillae are absent from the upper side of the mouth. Denticles are arranged in a variable number of single rows (Llorente et al. 1994), but the most common formula is 2(2)/3(1). The dorsal fin is low, starting at the level of the spiracle. The tip of the tail is pointed. Ground coloration is green or light brown, with small, dark dots. These dots are denser and larger in the tail fin. The tail presents a typical pattern with three longitudinal dark stripes. The ventral coloration is white.

Sunday, 3 May 2015

29-4-2015 MONTE CORONA, VALENCIA - SIERRA NEVADA OCELLATED LIZARD (Timon nevadensis)


Timon nevadensis, the Sierra Nevada lizard, is a species of lizard in the family Lacertidae. It is endemic to Spain. It is sometimes considered a subspecies of the ocellated lizard.
Formerly, Timon nevadensis had been regarded as subspecies of Timon lepidus but it has been put into species rank in 2013. Its distribution range is limited to the Sierra Nevada and the Spanish east coast, reaching the Alicante Province in the north.

The Sierra Nevada Ocellated Lizard is an impressive but terribly shy Lacertid. In particular, adult specimens may have flight distances of more than 20 meters. These lizards occur in high altitude mountain areas as well as in coastal dunes and agricultural land.


Adult specimens differ from Timon lepidus by the grey or brown basic coloration with no or reduced black markings.

Juveniles and subadults of Timon nevadensis frequently show dark edges on the labial scales which lack in juvenile Timon lepidus. However, there seem to exist populations with intermediate characteristics.

Within its distribution range, Timon nevadensis cannot be confused with other lizards, due to its big size of adults and the distinct white spot pattern of the juveniles.


23-3-2015 PENANG HILLS, MALAYSIA - LONG TAILED MACAQUE (Macaca fascicularis)


The crab-eating macaque (Macaca fascicularis), also known as the long-tailed macaque and referred to as the cynomolgus monkey in laboratories, is a cercopithecine primate native to Southeast Asia. A species of macaque, the crab-eating macaque has a long history alongside humans. The species has been variously seen as an agricultural pest, a sacred animal, and, more recently, the subject of medical experiments.

The crab-eating macaque lives in matrilineal social groups of up to eight individuals dominated by females. Male members leave the group when they reach puberty. It is an opportunistic omnivore and has been documented using tools to obtain food in Thailand and Myanmar. The crab-eating macaque is a known invasive species and a threat to biodiversity in several locations, including Hong Kong and western New Guinea. The significant overlap in macaque and human living space has resulted in greater habitat loss, synanthropic living, and inter- and intraspecies conflicts over resources.


Macaca comes from the Portuguese word macaco, which was derived from makaku, a word in Ibinda, a language of Central Africa (kaku means monkey in Ibinda). The specific epithet fascicularis is Latin for a small band or stripe. Sir Thomas Raffles, who gave the animal its scientific name in 1821, did not specify what he meant by the use of this word.

In Indonesia and Malaysia, the crab-eating macaque and other macaque species are known generically as kera, possibly because of their high-pitched cries.


The crab-eating macaque has several common names. It is often referred to as the long-tailed macaque due to its tail, which is often longer than its body. The name crab-eating macaque refers to its being often seen foraging beaches for crabs. Another common name for M. fascicularis is the cynomolgus monkey, from the name of a race of humans with long hair and handsome beards who used dogs for hunting according to Aristophanes of Byzantium, who seemingly derived the etymology of the word cynomolgus from the Greek κύων, cyon 'dog' (gen. cyno-s) and the verb ἀμέλγειν, amelgein 'to milk' (adj. amolg-os), by claiming that they milked female dogs. This name is commonly used in laboratory settings.


The crab-eating macaque's native range encompasses most of mainland Southeast Asia, from extreme southeastern Bangladesh south through the Malay Peninsula and Singapore, the Maritime Southeast Asia islands of Sumatra, Java, and Borneo, offshore islands, the islands of the Philippines, and the Nicobar Islands in the Bay of Bengal. This primate is a rare example of a terrestrial mammal that violates the Wallace line, being found out across the Lesser Sunda Islands. It lives in a wide variety of habitats, including primary lowland rainforests, disturbed and secondary rainforests, shrubland, and riverine and coastal forests of nipa palm and mangrove. It also easily adjusts to human settlements and is considered sacred at some Hindu temples and on some small islands, but as a pest around farms and villages. Typically, it prefers disturbed habitats and forest periphery.


The body length of the adult, which varies among subspecies, is 38–55 cm (15–22 in) with relatively short arms and legs. Males are considerably larger than females, weighing 5–9 kg (11–20 lb) compared to the 3–6 kg (6.6–13.2 lb) of females. The tail is longer than the body, typically 40–65 cm (16–26 in), which is used for balance when they jump distances up to 5 m (16 ft). The upper parts of the body are dark brown with light golden brown tips. The under parts are light grey with a dark grey/brown tail. Crab-eating macaques have backwards-directed crown hairs which sometimes form short crests on the midline. Their skin is black on their feet and ears, whereas the skin on the muzzle is a light grayish pink color. The eyelids often have prominent white markings and sometimes there are white spots on the ears. Males have a characteristic mustache and cheek whiskers, while females have only cheek whiskers. Crab-eating macaques have a cheek pouch which they use to store food while foraging. Females show no perineal swelling.


Macaques live in social groups that contain three to 20 females, their offspring, and one or many males. The groups usually have fewer males than females. In social groups of macaques, a clear dominance hierarchy is seen among females. These ranks remain stable throughout the female's lifetime and also can be sustained through generations of matrilines. Females have their highest birth rates around 10 years of age and completely stop bearing young by age 24.
The social groups of macaques are female-bonded, meaning the males will disperse at the time of puberty. Thus, group relatedness on average appears to be lower than compared to matrilines. More difference in relatedness occurs when comparing high-ranking lineages to lower ranking lineages, with higher-ranking individuals being more closely related to one another. Additionally, groups of dispersing males born into the same social groups display a range of relatedness, at times appearing to be brothers, while at other times appearing to be unrelated.

In addition to the matrilineal dominance hierarchy, male dominance rankings also exist. Alpha males have a higher frequency of mating compared to their lower-ranking conspecifics. The increased success is due partially to his increased access to females and also due to female preference of an alpha male during periods of maximum fertility. Though females have a preference for alpha males, they do display promiscuous behavior. Through this behavior, females risk helping to rear a non-alpha offspring, yet benefit in two specific ways, both in regard to aggressive behavior. First, a decreased value is placed on one single copulation. Moreover, the risk of infanticide is decreased due to the uncertainty of paternity.

Saturday, 2 May 2015

19-3-2015 JURONG, SINGAPORE - DALMATIAN PELICAN (Pelecanus crispus)


Dalmatian pelican (Pelecanus crispus) – more than a pink pelican, distinguished by the absence of pink tones in the plumage. On the head and the upper side of the neck are long and twisted curly feathers which form the likeness of a mane. It takes off fairly easily, pushing the water with both feet, but when it has a catch in its throat bag, gets up with difficulty.


The Dalmatian pelican (Pelecanus crispus) is the largest member of the pelican family, and perhaps the world's largest freshwater bird, although rivaled in weight and length by the largest swans. They are elegant soaring birds, with wingspans rivaling those of the great albatrosses, and their flocks fly in graceful synchrony. With a range spanning across much of Central Eurasia, from the Mediterranean in the West to the Taiwan Strait in the East, and from the Persian Gulf in the South to Siberia in the North, it is a short-to-medium-distance migrant between breeding and overwintering areas. No subspecies are known to exist over its wide range, but based on size differences, a Pleistocene paleosubspecies, P. c. palaeocrispus, has been described from fossils recovered at Binagady, Azerbaijan.


As with other pelicans, the males are larger than the females, and likewise their diet is mainly fish. Their curly nape feathers, grey legs and silvery-white plumage are distinguishing features, and the wings appear solid grey in flight. The adults acquire a drabber plumage in winter, however, when they may be mistaken for great white pelicans. Their harsh vocalizations become more pronounced during the mating season. They breed across the Palearctic from southeastern Europe to Russia, India and China in swamps and shallow lakes. They usually return to traditional breeding sites, where they are less social than other pelican species. Their nests are crude heaps of vegetation, which are placed on islands or on dense mats of vegetation.

The species' numbers underwent a dramatic decline during the 20th century, partly due to land use, disturbance and poaching activities. The core population survives in Russia, but in its Mongolian range it is critically endangered. Removal of power lines to prevent collisions or electrocution and construction of nesting platforms or rafts have reversed declines locally.


The Dalmatian pelican is found in lakes, rivers, deltas and estuaries. Compared to the great white pelican, the Dalmatian is not as tied to lowland areas and will nest in suitable wetlands with many elevations. It is less opportunistic in breeding habitat selection than the great white, usually returning to a traditional breeding site year after year unless it becomes completely unsuitable. During the winter, Dalmatian pelicans usually stay on ice-free lakes in Europe or jheels (seasonal lakes) in India. They also visit, typically during winter, inshore areas along sheltered coasts for feeding.