Introduction
The Groove-billed Ani (Crotophaga sulcirostris) is a social cuckoo of open and semi-open habitats in the Americas. It is recognised by its all-black plumage, long tail and large bill marked by longitudinal grooves. Groups often forage together and share a communal nest.
Physical Description
The Groove-billed Ani is a medium-sized bird measuring approximately 33–36 centimetres in length. It has glossy black plumage, sometimes showing blue or green iridescence in good light, and a long, drooping tail. The thick, laterally compressed bill is strongly curved and has conspicuous grooves along the upper mandible.
The eyes are dark, and the legs and feet are relatively large for a cuckoo. Males and females are similar in appearance, with no consistently obvious sexual difference in the field. Young birds are generally duller and less glossy than adults. The species has zygodactyl feet, with two toes pointing forwards and two backwards, a characteristic shared with other cuckoos and several unrelated bird groups.
Range and Habitat
The Groove-billed Ani occurs from southern Texas and Mexico through Central America into northern South America, including parts of Colombia, Venezuela and Ecuador. It is largely resident across its tropical range, although local movements and seasonal changes in numbers occur. In the United States, it is mainly associated with southern Texas.
It favours open and semi-open lowland habitats, including thornscrub, savanna, grassland, pasture, scrub, agricultural land and woodland edges. Scattered bushes and small trees provide cover, nesting sites and roosting places. The species can also use disturbed areas, parks and other human-modified landscapes where suitable vegetation remains.
Where to See This Species
Bentsen-Rio Grande Valley State Park, Texas, United States
Texas Parks and Wildlife Department lists the Groove-billed Ani among the species found at Bentsen-Rio Grande Valley State Park. The park’s mixture of native brushland, woodland, wetland and riparian habitat makes it a realistic place to search in the Lower Rio Grande Valley. Look along trails and in dense low vegetation, particularly where open ground meets brush.
Nearby accommodation: Mission and McAllen provide the nearest broad range of hotels, guest houses and self-catering accommodation. Camping is also available at the park.
Estero Llano Grande State Park, Texas, United States
The Groove-billed Ani is identified by Texas Parks and Wildlife Department as a bird of the woodland and thornscrub at Estero Llano Grande State Park. The park is in the Lower Rio Grande Valley, where tropical species reach the northern edge of their United States range. Search the scrub and woodland margins as well as areas bordering open ground.
Nearby accommodation: Weslaco is the nearest practical town, with hotels, guest houses and self-catering accommodation available in the surrounding Lower Rio Grande Valley.
Behaviour and Diet
Groove-billed Anis are highly gregarious. Groups may contain several breeding pairs, which maintain a shared territory and often perch close together. They may sun themselves, preen one another and move through vegetation in loose groups. Their long tails are frequently flicked or waved, possibly helping to flush insects from cover.
The species is primarily an insectivore. Its prey includes grasshoppers, crickets, beetles, ants, spiders and other arthropods, along with small lizards, amphibians and other small vertebrates. It also takes fruit and seeds occasionally. Anis forage on the ground and in low vegetation, sometimes following cattle or other large animals that disturb hidden prey. They may also forage near army-ant swarms.
Breeding is communal. Several pairs may contribute to one bulky nest built from twigs, grasses, leaves and other plant material in a shrub or small tree. Several females can lay in the same nest, and the eggs are incubated by members of the group. All group members help feed and protect the young after hatching. Clutch size varies, but communal nests may contain substantially more eggs than a nest produced by a single pair.
Identification Tips
- Look for an entirely black, medium-sized bird with a long, often drooping tail.
- The large, grooved bill is the most useful diagnostic feature. The grooves are especially noticeable along the upper mandible.
- Behaviour is often distinctive. Groups clamber through bushes, hop across open ground and follow cattle or other animals while searching for flushed insects.
- The plumage may appear blue-green or purple-black in bright light, but the overall impression remains uniformly dark.
- The similar Smooth-billed Ani (Crotophaga ani) usually has a smoother, more strongly arched bill. Care is needed because bill shape can vary, so location, habitat and the complete combination of features should be considered.
Conservation Status
The Groove-billed Ani is listed as Least Concern on the IUCN Red List. Its extensive distribution, use of open and disturbed habitats, and locally common populations reduce its immediate risk of global extinction. Nevertheless, habitat loss, fragmentation and degradation caused by agricultural expansion, urbanisation and other land-use changes can reduce local populations.
In the United States, the species is concentrated in southern Texas and is uncommon compared with its abundance in much of the tropics. Conservation depends on retaining native thornscrub, woodland edges, pasture and other suitable cover, together with continued monitoring of population trends.
Frequently Asked Questions
Where can the Groove-billed Ani be found?
It occurs from southern Texas and Mexico through Central America to northern South America. It is most often found in warm, open or semi-open habitats with scattered shrubs and trees.
What does a Groove-billed Ani look like?
It is an all-black cuckoo with a long tail and a large, curved bill marked by grooves. Adults may show a blue or green sheen in bright light.
What does the Groove-billed Ani eat?
Its diet consists mainly of insects and other arthropods, supplemented by small lizards, amphibians, other small animals, fruit and seeds.
Do Groove-billed Anis live in groups?
Yes. They are social birds that commonly live in groups containing several breeding pairs. Group members share territory defence, incubation and care of the young.
Does the Groove-billed Ani migrate?
The species is largely resident across its tropical range. Local movements and seasonal changes in abundance can occur, while birds in southern Texas may be more local or seasonally variable than those farther south.
How is the Groove-billed Ani different from the Smooth-billed Ani?
The Groove-billed Ani generally has a more visibly grooved bill with a less strongly arched upper profile. The Smooth-billed Ani usually has a smoother, more arched bill, although individual variation means that several field marks should be assessed together.
References
- Cornell Lab of Ornithology
- Texas Parks and Wildlife Department
- IUCN Red List of Threatened Species
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