28-3-2017 TARCOLES RIVER COSTA RICA - YELLOW CROWNED NIGHT HERON (JUVENILE) (Nyctanassa violacea)

The Yellow-crowned Night Heron (Nyctanassa violacea) is a stocky wading bird, with a robust build and a notable large head in proportion to its body. It possesses a hefty bill, set deep under its eyes, and exhibits a wingspan of 101 to 112 cm. The species displays sexual dimorphism, with females slightly smaller than males.

Adults are characterized by a smooth grey-blue body with a black scaled pattern on the wings. Their long legs, which turn coral, pink, or red during courtship, are initially yellow. The head is strikingly black and glossy, with white cheeks and a pale yellow crown that extends from the bill, between the eyes, to the back of the head. This distinctive feature gives the bird its common name. In flight, the Yellow-crowned Night Heron can be distinguished by its long, slow wing beats and legs that extend straight below the tail.

This heron favors shallow waters such as marshes, wooded swamps, and lakeshores for inland populations, and thickets, mangroves, and cliff-bound coasts for coastal populations. It is also found in periodically flooded areas and tolerates a range of water types from fresh to brackish and saline.

The Yellow-crowned Night Heron is endemic to the Americas, with a distribution that closely follows the availability of crustaceans. Its range extends from the southeastern United States to Peru and Brazil in coastal regions.

This species is known for its nocturnal feeding habits, particularly during the breeding season when it feeds its young. It is territorial when foraging but will tolerate others at a safe distance. The heron selects prey visually, employing various hunting strategies, including stalking and standing still before lunging with its bill.

The heron's vocal repertoire includes a loud, sharp squawk used as an alarm or aggression call, a soft chu-chu-chu by begging chicks, and a range of calls during courtship, such as the yup-yup greeting and a concluding whoop from the male.

Breeding is synchronized with the emergence of crabs in spring, varying geographically. The heron forms mating pairs, with some arriving at breeding grounds already paired. Nesting occurs in trees, bushes, or on rock ledges, with both parents involved in nest-building and care of the young.

Juvenile Yellow-crowned Night Herons can be confused with juvenile Black-crowned Night Herons. However, the former tend to stand straighter, have heavier bills, longer legs, and finer spots and streaks on their plumage.

The diet is predominantly crustaceans, with crabs and crayfish being the mainstay. It also consumes insects, fish, worms, amphibians, molluscs, lizards, snakes, small rodents, and birds. The heron's bill size and shape are adapted to the specific prey available in its region.

The Yellow-crowned Night Heron is classified as Least Concern by the IUCN, indicating a stable population trend. However, it faces threats such as habitat loss, human disturbance, and in some regions, illegal hunting. Conservation efforts are generally part of broader wetland conservation projects.

28-3-2017 TARCOLES RIVER, COSTA RICA - OSPREY (Pandion haliaetus)

The osprey, known by various monikers such as sea hawk, river hawk, and fish hawk, is a diurnal raptor with a cosmopolitan range. This large bird of prey boasts a length exceeding 60 cm (24 in) and a wingspan reaching 180 cm (71 in). Its upperparts are cloaked in a rich brown, while its head and underparts are adorned with a more subdued greyish hue.

When identifying an osprey, look for its distinctive white head marked with a dark eye mask that extends to the neck's sides. Its eyes are a captivating golden to brown, and its bill is a stark black tipped with a blue cere. The osprey's feet are an intriguing white, contrasted with black talons. In flight, its long, narrow wings with finger-like feathers and a shorter fifth feather give it a unique silhouette.

The osprey is quite adaptable, making its home in a variety of habitats as long as they are in proximity to water bodies that can provide an ample supply of fish.

This raptor graces all continents with its presence, save for the icy expanse of Antarctica. In South America, it is seen only as a non-breeding migrant.

Ospreys are known for their remarkable fishing prowess, diving into water bodies to catch their prey with their reversible outer toes and barbed talons. They are also known to be monogamous, often mating for life.

The osprey's vocalizations consist of a series of sharp whistles, often described as "cheep, cheep" or "yewk, yewk." When its nest is threatened, it may emit a frantic "cheereek!"

Ospreys typically breed near freshwater or brackish waters. They construct large nests made of sticks and other materials, where they lay two to four eggs. The eggs are incubated for about 35–43 days before hatching.

The osprey is unique in its family, Pandionidae, and thus has no very close similar species. However, its size and shape may sometimes be confused with various members of the Buteo or Falco genera from a distance.

The osprey's diet is almost exclusively composed of fish, which it catches with a spectacular plunge-dive. It has keen eyesight adapted for detecting underwater prey from above the surface.

The osprey is currently listed as Least Concern by the IUCN, with a large and stable global population. However, regional declines have been noted in some areas, such as South Australia.

28-3-2017 CARARA NAT PARK, COSTA RICA - BLACK SPINY TAILED IGUANA (Ctenosaura similis)

Ctenosaura similis, commonly known as the black iguana or black spiny-tailed iguana, is a lizard native to Mexico, Central America, and some Colombian islands in the Caribbean Sea and Pacific Ocean. It has been introduced to the United States in the state of Florida. It is the largest species in the genus Ctenosaura.

Black spiny-tailed iguanas are large lizards native to Mexico and Central America. They have distinctively black, keeled scales on their long tails, which gives them their common name. They have a crest of long spines that extends down the center of the back. Although coloration varies extremely among individuals of the same population, adults usually have a whitish-gray or tan ground color with a series of 4-12 well-defined dark dorsal bands that extend nearly to the ventral scales. Males also develop an orange color around the head and throat during breeding season with highlights of blue and peach on their jowls.

Black spiny-tailed iguanas range from the Isthmus of Tehuantepec (Mexico) to northeastern Nicaragua and western Panama on the respective Atlantic and Pacific coasts. They are commonly found throughout Costa Rica, Honduras and have been reported in Colombia. These iguanas live in dry and moist forests and also occur in open terrains such as savanna, grassland, and shrubland. They can also be found on sandy beaches, in coastal lagoons, marshes, and near urban areas.

Black spiny-tailed iguanas are social and territorial animals that live in colonies. They are active during the day. Although mainly terrestrial, these iguanas are excellent climbers, and prefer rocky areas with plenty of crevices to hide in, rocks to bask on, and nearby trees to climb. They are fast-moving creatures that employ their speed to escape predators but will lash with their tails and bite if cornered.

Black spiny-tailed iguanas generally breed in spring. Males show dominance and interest by head bobbing and may chase the female until they can catch her. Within 8 to 10 weeks, the female will dig a nest and lay a clutch of up to 30 eggs. The eggs hatch 90 days later and the hatchlings dig their way out of the sand. The young are typically green in color with brown markings, although all brown hatchlings have been recorded as well.

28-3-2017 CARARA NAT PARK, COSTA RICA - GROOVE BILLED ANI (Crotophaga sulcirostris)

The Groove-billed Ani, Crotophaga sulcirostris, is a distinctive tropical bird belonging to the cuckoo family. It is characterized by its long tail and an impressively large, curved beak adorned with longitudinal grooves. This bird's plumage is entirely black, and it possesses a wingspan of 41-46 cm (16-18 in), with a body length of about 34 cm (13 in) and a weight ranging from 70–90 g (2.5–3.2 oz).

When identifying the Groove-billed Ani, look for its very long tail, which is nearly as long as its body, and its massive bill with grooves running the length of the upper mandible. In flight, this bird exhibits a pattern of quick, choppy flaps followed by short glides. It can be confused with the Smooth-billed Ani, but the two can be differentiated by their vocalizations and geographic range.

The Groove-billed Ani is typically found in open and semi-open landscapes, including pastures, savannas, and orchards. It thrives in these environments where it can forage and live in small communal groups.

This bird is a resident species across its range, which extends from southern Texas, central Mexico, and The Bahamas, through Central America, to northern Colombia and Venezuela, as well as coastal regions of Ecuador and Peru. It retreats from the northernmost parts of its range in Texas and northern Mexico during the winter months.

The Groove-billed Ani is a social creature, living in small groups consisting of one to five breeding pairs. These groups defend a shared territory and collaborate in nesting activities within a single communal nest.

8-1-2018 PEGO MARJAL, ALICANTE - GLOSSY IBIS (Plegadis falcinellus)

8-1-2018 PEGO MARJAL, ALICANTE - LITTLE EGRET (Egretta garzetta)

The Little Egret, Egretta garzetta, is a dainty heron adorned in pure white plumage. It is characterized by a slender black beak, long black legs, and, notably in the western race, yellow feet. This elegant bird is a sight to behold with its graceful neck and poised stance.

Adult Little Egrets measure between 55–65 cm in length with a wingspan of 88–106 cm, and weigh 350–550 g. Their plumage is predominantly white, though some may exhibit bluish-grey coloration. Breeding adults boast ornate nape plumes reaching about 150 mm, along with distinctive feathers on the breast and elongated scapulars. The bill and lores are black, with greenish-grey skin at the base of the lower mandible and around the eye, which houses a yellow iris. Legs are black with contrasting yellow feet, though juveniles may have greenish-black legs and duller feet. The subspecies E. g. nigripes is distinguished by yellow skin between the bill and eye, and blackish feet.

The Little Egret frequents a variety of wetland habitats, from the shores of lakes and rivers to marshes and coastal regions. It is often found in open environments, such as mangroves, swamps, mudflats, and sandy beaches, as well as human-altered landscapes like rice fields.

The species has a broad breeding distribution across warm temperate to tropical regions of Asia, Africa, Australia, and Europe. Northern populations are migratory, wintering in Africa and southern Asia, while others remain as permanent residents in warmer areas.

Little Egrets are social yet territorial when feeding. They exhibit a range of foraging behaviors, from active chasing to patient ambush. Their movements are often in response to the presence of other animals, which may stir up prey.

The Little Egret's vocalizations include croaking and bubbling sounds at breeding colonies and a harsh alarm call when disturbed. These calls are similar to those of the Black-crowned Night Heron and the Cattle Egret.

Breeding colonies are often mixed with other water birds. Nests are platforms of sticks located in trees, shrubs, or reed beds. Clutches typically consist of three to five bluish-green eggs, incubated by both parents for about three weeks. The young fledge at approximately six weeks old.

The Little Egret can be confused with other white egrets, particularly the Snowy Egret, which shares some of its New World range. However, the Little Egret is larger and has more varied foraging strategies.

The diet is diverse, including fish, amphibians, small reptiles, mammals, birds, crustaceans, molluscs, insects, spiders, and worms. The Little Egret employs various hunting techniques, both in water and on land, to capture its prey.

The Little Egret is classified as "Least Concern" by the IUCN. Conservation measures in the 20th century have allowed populations to recover in Europe, and the species has been expanding its range. It is now successfully colonizing new areas, including the New World.

8-1-2018 ROTOVA, VALENCIA - EUROPEAN ROBIN (Erithacus rubecula)

8-1-2018 PEGO MARJAL, ALICANTE - EUROPEAN STONECHAT (Saxicola rubicola)

8-1-2018 PEGO MARJAL, ALICANTE - BLACK REDSTART (FEMALE) (Phoenicurus ochruros)

28-3-2017 CARARA NAT PARK, COSTA RICA - NORTHERN GHOST BAT (Diclidurus albus)

The northern ghost bat can be distinguished from other members of its genus by the presence of a vestigial thumb with a near-absent claw. Amongst the northern ghost bat population, sexual dimorphism is present. Specifically, males tend to be slightly larger in size when compared to females. Diclidurus albus is intermediate in weight relative to other members of the family Emballonuridae.

The northern ghost bat has a widely shaped clavicle bone, with large areas of attachment for the pectoralis muscle. It also has a large glandular structure on its uropatagium. The functional significance of this glandular structure is thought to be analogous to that of wing sacs in other emballonurids. When breeding, the wing sacs of other emballonurids become enlarged to attract females.

The penis of the northern ghost bat does not employ a baculum, but rather, is composed of four cartilaginous bodies. It is about 5.5 mm long and 3.1 mm in diameter. The glans penis is white in color, and the prepuce is encased in a layer of short, fine hair. The testes are spindle-like in shape, symmetrical, and enclosed in a black tunica. In females, the ovaries are ovoid in shape and are roughly 2.8 mm long and 0.8 mm in diameter.

28-3-2017 CARARA NAT PARK, COSTA RICA - LEAST FLYCATCHER (Empidonax minimus)

The Least Flycatcher, known scientifically as Empidonax minimus, is a diminutive avian insectivore and the smallest member of the Empidonax genus found in eastern North America. This bird is characterized by its dull olive-gray upperparts and a notably brighter whitish underbelly compared to its congeners. It sports two distinctive white wing bars and has white eye rings that add to its identification. The beak of the Least Flycatcher is short, with a yellowish lower mandible. Adult birds typically measure between 12 to 14 cm in height, possess a wingspan ranging from 19 to 22 cm, and weigh around 10.3 grams. Juveniles resemble adults but have slightly darker wing bars tinged with tawny or olive hues.

To distinguish the Least Flycatcher from other similar species, one should pay close attention to its vocalizations and preferred habitats. Its wings are marked with two white bars, and it has white rings around its eyes. The bird's call, a piercing "che-bec" with the second syllable louder than the first, is a reliable identifier, especially when heard in its favored environments.

The Least Flycatcher frequents aspen groves, orchards, open woods, and shade trees. It breeds in deciduous or mixed forests, sometimes in coniferous stands, often near clearings or edges. In winter, it migrates to Central America, where it can be found in forest edges and secondary growth.

This species breeds in the Eastern Rockies of Canada, Central-North, and Northeastern United States. Come winter, it migrates to Central America, from Mexico to Panama, and can also be found in villages, city parks, and along rural roads within its range.

The Least Flycatcher is known for its territorial nature, with both males and females aggressively defending their breeding grounds. Males sing to establish and maintain territories, while females are more subdued but will defend the nest with vigor when necessary.

The bird's call is a distinctive, emphatic "che-bec," with the second syllable louder. Males sing this call repeatedly, especially in the morning, to defend their territory. Females use a "chweep" note for communication with their mate and offspring, and when defending the nest.

Breeding pairs of Least Flycatchers select sites based on the proximity of neighbors rather than habitat quality. The female weaves a tidy cup-shaped nest using grass, bark, spider webs, and other materials. She lays three to five creamy-white eggs, which she incubates for 13 to 16 days. Both parents feed the nestlings, which fledge at 12 to 17 days old.

The diet of the Least Flycatcher consists mainly of insects, including wasps, ants, beetles, caterpillars, and spiders. It forages by watching from a perch and catching insects mid-flight or from vegetation, often hovering to attack prey.

The Least Flycatcher is currently listed as Least Concern by the IUCN, indicating that it is not at immediate risk of population decline or habitat loss at a global scale.

29-3-2017 HOTEL BOUGANVILLEA, COSTA RICA - RUFOUS TAILED HUMMINGBIRD (Amazilia tzacatl)

The rufous-tailed hummingbird, Amazilia tzacatl, is a medium-sized member of the hummingbird family, Trochilidae, known for its distinctive chestnut-brown tail. This avian jewel measures between 9 to 11 cm in length and weighs around 5 grams, with males and females exhibiting slight variations in plumage.

Adult males of the nominate subspecies boast a green crown and upperparts, save for the chestnut-brown lores and uppertail coverts. The tail is predominantly chestnut-brown with bronze-green tips. The throat and upper breast shimmer with green, and the lower breast transitions to gray, leading to a white belly and chestnut-brown undertail coverts. Females have a paler gray lower breast and more pronounced scalloping on the throat. Juveniles display a cinnamon wash on the lower breast and sides, with cinnamon-tipped lower back and rump feathers. The bill is a striking combination of black and red, with the outer half of the maxilla black and the inner half red, while the mandible is red with a black tip.

This species thrives in open landscapes such as clearings, gardens, and forest edges, as well as in low, brushy secondary forests. It is also a frequent visitor to feeders.

The rufous-tailed hummingbird is found from east-central Mexico through Central America and Colombia, extending into Ecuador and Venezuela. It occupies a range of elevations from sea level up to 2,500 meters in Ecuador, though such high altitudes may be seasonal or local.

Renowned for its territorial nature, the rufous-tailed hummingbird is a fierce defender of feeding territories, including flower patches and feeders, where it will chase away other hummingbirds and large insects.

The species' vocalizations include a high, thin, and squeaky song composed of chirps and tsi sounds, as well as hard, smacking calls and dry chips that can merge into a rattling sound.

The rufous-tailed hummingbird is polygynous and may nest in loose colonies. The female single-handedly constructs a cup nest from plant fibers, leaves, and spiderwebs, adorned with lichens and mosses. She lays two white eggs, which she incubates for 15 to 19 days, with fledglings leaving the nest after another 18 to 22 days.

While there are several subspecies of the rufous-tailed hummingbird, they can be distinguished by size, bill shape, and coloration details. For example, A. t. handleyi is larger and darker, while A. t. fuscicaudata is smaller with a shorter bill.

 

The diet consists primarily of nectar and small insects. This hummingbird is a common sight in coffee and banana plantations and is known to frequent sugar water feeders.

The IUCN has classified the rufous-tailed hummingbird as Least Concern, with an estimated population of over five million mature individuals. The species may even benefit from certain human activities that create open spaces suitable for its habitat.

30-3-2017 HOTEL BOUGANVILLEA, COSTA RICA - CLAY COLOURED THRUSH (Turdus grayi)

The Clay-colored Thrush, Turdus grayi, is a bird of modest plumage, its feathers a subtle palette of brown hues, lighter on the flanks and faintly streaked on the throat. This bird, similar in size to the American Robin, measures approximately 23 to 27 centimeters in length and weighs between 74 to 76 grams. The young are distinguished by a faint mottling on their backs and underparts. Notable identification features include a greenish-yellow bill with a dark base, pinkish or flesh-colored legs, and reddish irises.

When identifying the Clay-colored Thrush, look for its brownish plumage, which is lighter below and lightest on the flanks. The throat bears faint streaks, and the bird's bill is greenish-yellow with a dark base. The legs are pinkish or flesh-colored, and the irises are a distinctive reddish color. Juveniles may exhibit faint mottling on their back and underparts.

The Clay-colored Thrush is a familiar sight in yards and gardens, much like its relatives the American Robin, the Eurasian Blackbird, and the Song Thrush. It thrives in a variety of habitats, from South Texas to northern Colombia, often found in human-altered landscapes where fruiting trees are present.

This bird's range extends from South Texas, where it is expanding its territory, to northern Colombia. It is predominantly found on the Atlantic slope west and north of the Isthmus of Tehuantepec, with an isolated population around Oaxaca City, Mexico.

7-1-2018 VILLALONGA RESERVOIR, VALENCIA - EURASIAN GREAT CORMORANT (Phalacrocorax carbo)

7-1-2018 LA FONT EN CARROS, VALENCIA - WHITE WAGTAIL (Motacilla alba)

7-1-2018 LA FONT EN CARROS, VALENCIA - MEADOW PIPIT (Anthus pratensis)

The Meadow Pipit, Anthus pratensis, is a small, unassuming bird of the 

passerine family. It measures between 14.5 to 15 cm in length and weighs a mere 15 to 22 grams. Its plumage is predominantly brown above and buff below, with darker streaks adorning most of its body. The tail is brown with narrow white edges, and it stands on pale pinkish-yellow legs. A distinctive feature is its notably long hind claw, surpassing the length of its other hind toes.

When identifying the Meadow Pipit, look for its streaked appearance and listen for its weak "tsi-tsi" call. In flight, observe its song, which is a simple, repetitive tune that increases in pace towards the end. The bird's small size and long hind claw are also key identification markers.

7-1-2018 LA FONT EN CARROS, VALENCIA - COMMON CHIFFCHAFF (Phylloscopus collybita)

6-1-2018 MONTE CORONA, VALENCIA - VESPERUS BEETLE (Superfamily Chrysomeloidea)

28-3-2017 VILLA LAPAS, COSTA RICA - BLACK SPINY TAILED IGUANA (Ctenosaura similis)

Ctenosaura similis, commonly known as the black iguana or black spiny-tailed iguana, is a lizard native to Mexico, Central America, and some Colombian islands in the Caribbean Sea and Pacific Ocean. It has been introduced to the United States in the state of Florida. It is the largest species in the genus Ctenosaura.

Black spiny-tailed iguanas are large lizards native to Mexico and Central America. They have distinctively black, keeled scales on their long tails, which gives them their common name. They have a crest of long spines that extends down the center of the back. Although coloration varies extremely among individuals of the same population, adults usually have a whitish-gray or tan ground color with a series of 4-12 well-defined dark dorsal bands that extend nearly to the ventral scales. Males also develop an orange color around the head and throat during breeding season with highlights of blue and peach on their jowls.

Black spiny-tailed iguanas range from the Isthmus of Tehuantepec (Mexico) to northeastern Nicaragua and western Panama on the respective Atlantic and Pacific coasts. They are commonly found throughout Costa Rica, Honduras and have been reported in Colombia. These iguanas live in dry and moist forests and also occur in open terrains such as savanna, grassland, and shrubland. They can also be found on sandy beaches, in coastal lagoons, marshes, and near urban areas.

Black spiny-tailed iguanas are social and territorial animals that live in colonies. They are active during the day. Although mainly terrestrial, these iguanas are excellent climbers, and prefer rocky areas with plenty of crevices to hide in, rocks to bask on, and nearby trees to climb. They are fast-moving creatures that employ their speed to escape predators but will lash with their tails and bite if cornered.Black spiny-tailed iguanas generally breed in spring. Males show dominance and interest by head bobbing and may chase the female until they can catch her. Within 8 to 10 weeks, the female will dig a nest and lay a clutch of up to 30 eggs. The eggs hatch 90 days later and the hatchlings dig their way out of the sand. The young are typically green in color with brown markings, although all brown hatchlings have been recorded as well.

29-3-2017 HOTEL BOUGANVILLEA,COSTA RICA - RUFOUS COLLARED SPARROW (Zonotrichia capensis)

The Rufous-collared Sparrow, also known as the Andean Sparrow, is a small, charming bird measuring 13.5–15 cm in length and weighing between 20–25 grams. Adults are recognized by their stubby grey bills and a distinctive grey head marked with broad black stripes on the crown sides, and thinner stripes through the eye and below the cheeks. A notable rufous nape and breast sides complement their black-streaked buff-brown upperparts, and they exhibit two white wing bars. Their throats are white, transitioning to off-white underparts that become brown on the flanks, highlighted by a black breast patch. Juveniles present a more subdued appearance with duller, indistinct head patterns and streaked underparts, lacking the adult's rufous collar.

When identifying this species, look for the rufous collar around the nape and the black stripes on the head. The two white wing bars are also key features. The largest subspecies, found on the tepuis, has grey underparts and a more extensive rufous collar that appears as a band of black freckles across the breast.

The Rufous-collared Sparrow thrives in a variety of open or semi-open habitats, including cultivated lands, gardens, parks, grasslands, and scrubby second growth or cerrado. It is well-adapted to urban and suburban environments but is notably absent from dense Amazonian forests.

This adaptable bird ranges from the extreme south-east of Mexico to Tierra del Fuego, and on the island of Hispaniola in the Caribbean. In the northern and western parts of its range, it is typically found at altitudes of 600–4,000 meters, while in the southern and eastern parts, it is commonly found down to near sea level.

The Rufous-collared Sparrow is often seen in pairs or small flocks, holding small territories. It is known for its tame and approachable nature, making it a familiar sight across its extensive range.

The male's song is a delightful mix of slurred whistles and trills, varying geographically. Calls include a sharp "tsip." Listen for songs that may include tee-teeooo, e’e’e’e’e, or teeooo, teeeee, often delivered from a low perch.

Breeding is influenced by food availability and rainfall. Nests are open cups of plant material lined with fine grasses, placed in vegetation on the ground or low in a tree or bush. Females lay two or three pale greenish-blue eggs with reddish-brown blotches, which are incubated for 12–14 days. Males assist in feeding the chicks, which fledge after about two weeks. Brood parasitism by species such as the shiny cowbird may occur.

This sparrow forages on the ground for seeds, fallen grain, insects, and spiders. It may join mixed-species feeding flocks and has been observed picking termites from spider webs.

The Rufous-collared Sparrow is classified as Least Concern by the IUCN, thanks to its widespread distribution and adaptability to human-altered environments.

29-3-2017 HOTEL BOUGANVILLEA, COSTA RICA - GROOVE BILLED ANI (Crotophaga sulcirostris)

The groove-billed ani (Crotophaga sulcirostris ) is a tropical bird in the cuckoo family with a long tail and a large, curved beak. It is a resident species throughout most of its range, from southern Texas, central Mexico and The Bahamas, through Central America, to northern Colombia and Venezuela, and coastal Ecuador and Peru. It only retreats from the northern limits of its range in Texas and northern Mexico during winter.

The groove-billed ani is about 34 cm (13 in) long, and weighs 70–90 g (2.5–3.2 oz). Wingspan ranges from 41-46 cm (16-18 in). It is completely black, with a very long tail almost as long as its body. It has a huge bill with lengthwise grooves running the length of the upper mandible. It is very similar to the smooth-billed ani, some specimens of which have bills as small as the groove-billed and with grooves on the basal half. The two species are best distinguished by voice and range. In flight, the ani alternates between quick, choppy flaps and short glides.

Like other anis, the groove-billed is found in open and partly open country, such as pastures, savanna, and orchards. It feeds largely on a mixed diet of insects, seeds, and fruits.

The groove-billed ani lives in small groups of one to five breeding pairs. They defend a single territory and lay their eggs in one communal nest. All group members incubate the eggs and care for the young.

The groove-billed ani is protected under the Migratory Bird Treaty Act of 1918.