Smooth-billed Ani

About

The Smooth-billed Ani is a medium-sized, glossy black cuckoo with a distinctive, deep, laterally compressed bill. It is known for its highly social behavior, often found in small flocks, and its cooperative breeding strategy where multiple females lay eggs in a single communal nest.

Size & lifespan

Length

30-36 cm (12-14 in)

Wingspan

43-46 cm (17-18 in)

Weight

70-100 g (2.5-3.5 oz)

Lifespan

Approximately 5-7 years in the wild

Diet

Omnivore (primarily insectivore)

Physical characteristics

Plumage

Entirely glossy black plumage, often appearing iridescent blue-purple or green in good light. The feathers on the head and neck can appear somewhat shaggy.

Beak shape

Large, deep, and laterally compressed (knife-like) black bill with a prominent arch to the culmen. The bill is smooth, lacking the grooves found in the Groove-billed Ani.

Eye color

Dark brown to black

Leg color

Black

Distinguishing features

The most distinctive feature is its large, smooth, arched black bill. Its overall glossy black appearance and long tail are also characteristic. The tail is often held loosely and appears somewhat disheveled.

Juvenile appearance

Juveniles resemble adults but may have a duller, less glossy black plumage and a slightly less developed bill structure. Their eyes may appear lighter brown initially.

Seasonal changes

No significant seasonal plumage changes. They maintain their glossy black plumage year-round.

Sexual dimorphism

Males and females are monomorphic, appearing identical in plumage and size.

How to identify

1. 1

   Bill Shape

   Look for the large, deep, and smooth black bill with a prominent arch. This is the key differentiator from the Groove-billed Ani.

2. 2

   Plumage

   Observe the entirely glossy black plumage, which can show iridescent blue or purple hues in sunlight. The feathers often appear somewhat shaggy, especially on the head.

3. 3

   Social Behavior

   Anis are almost always seen in small, noisy flocks, foraging together on the ground or perched closely in trees. Solitary individuals are rare.

4. 4

   Vocalizations

   Listen for their distinctive rising 'whee-oo' whistle and harsh 'churrr' calls. Their calls are often the first indication of their presence.

5. 5

   Habitat

   Check open, grassy areas with scattered shrubs and trees, especially pastures or agricultural fields, where they often follow livestock.

Habitat & range

Biomes

Tropical and subtropical lowlands, including open woodlands, savannas, pastures, agricultural fields, forest edges, and mangroves.

Geographic range

Southeastern United States (Florida), West Indies, Central America, and South America east of the Andes, south to northern Argentina. Introduced to some Caribbean islands.

Elevation range

Typically found from sea level up to 1,000 meters (3,300 feet), occasionally higher.

Preferred environments

Prefers open, grassy areas with scattered shrubs and trees, often near water. Frequently found in disturbed habitats, such as cattle pastures and cultivated lands, where insects are abundant.

Behavior

Activity time

Diurnal

Feeding habits

Primarily insectivorous, feeding on a wide variety of insects (grasshoppers, crickets, beetles, caterpillars, spiders) and other arthropods. They often forage on the ground, walking or running, and frequently follow grazing livestock to catch insects disturbed by their movement. They also consume small vertebrates (lizards, frogs) and some fruits and seeds, especially during the dry season.

Social behavior

Highly social, typically found in small flocks of 3-10 individuals, sometimes up to 20. These flocks are often family groups that engage in cooperative breeding. They are vocal and often perch together, preening each other.

Flight pattern

Weak, somewhat clumsy, and undulating flight with rapid wing beats, often interspersed with short glides. They typically fly short distances between perches or across open fields.

Migration pattern

Mostly resident throughout its range. Northern populations in Florida may show some local dispersal or short-distance movements, but no true long-distance migration.

Territoriality

Flocks maintain a communal territory, which they defend against other ani groups. Within the flock, there is a complex social hierarchy, particularly during breeding.

Breeding & reproduction

Breeding season

Varies geographically, typically coinciding with the rainy season and peak insect abundance. In Florida, March to August; in Central and South America, often April to September.

Nesting habits

Cooperative breeders. Multiple females (up to 4-5) lay their eggs in a single, large, cup-shaped communal nest, usually built 1-6 meters (3-20 feet) high in a thorny bush or tree. The nest is constructed from twigs and lined with leaves.

Clutch size

Individual females lay 3-5 eggs, but communal nests can contain 10-20 eggs, sometimes up to 29.

Egg description

Pale blue-green to dark blue-green, often covered with a chalky white layer that can be scraped off to reveal the true color. Elongated oval shape. Approximately 30-38 mm (1.2-1.5 in) long.

Incubation period

13-15 days, shared by all breeding adults in the flock.

Fledging period

10-12 days after hatching, young leave the nest but remain dependent on the flock for several weeks.

Parental care

All adult members of the flock participate in incubation, brooding, and feeding the young. There is often a dominant pair that contributes most to incubation, but all adults feed the chicks.

Where to find

Field tips

1. Listen for Calls. Their distinctive calls are often heard before the birds are seen. Learn their 'whee-oo' whistle and harsh 'churrr' calls.
2. Look for Flocks. Anis are rarely alone. Scan for groups of glossy black birds moving together on the ground or perched in low trees and bushes.
3. Check Near Livestock. If in suitable habitat with cattle or other grazing animals, observe the ground around them, as anis frequently follow them to catch insects.
4. Observe Flight. Their somewhat clumsy, undulating flight is characteristic. They often fly low over open ground.

Similar species

Quick facts

Diet:

Mainly insects, some small vertebrates and fruit

Social Structure:

Highly social, cooperative breeders in flocks

Nest Type:

Communal cup-shaped nest

Bill Feature:

Large, deep, smooth, arched black bill

Plumage Color:

Glossy black with iridescent sheen

Fun facts

• Smooth-billed Anis are cooperative breeders, meaning multiple females lay their eggs in a single nest, and all adults in the flock help incubate and raise the young. This is a rare strategy among birds.
• They are often seen following cattle or other grazing animals, using them as 'beaters' to flush out insects from the grass, a behavior known as commensal feeding.
• Despite being cuckoos, they are not brood parasites like many Old World cuckoos. Instead, they build their own nests, albeit communally.
• The chalky white layer on their eggs is unique and can be scraped off to reveal the true blue-green color underneath.

Scientific classification

Kingdom

Animalia

Phylum

Chordata

Class

Aves

Order

Cuculiformes

Family

Cuculidae

Genus

Crotophaga

Species

Crotophaga ani

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