Groove-billed Ani

Quick Facts

• Scientific Name: Crotophaga sulcirostris
• Spanish Name: Garrapatero piquisurcado
• Family: Cuculidae
• Known Nicknames: Black Witch, Tick-bird, Judío
• Average Length: 30–34 cm / 12–13.5 in
• Average Weight: 70–90 g / 2.5–3.2 oz
• Wingspan: 43–46 cm / 17–18 in
• Key Feature: Deeply grooved, arched black bill
• Primary Diet: Omnivore (Primarily insects, seeds, and small fruit)
• Range: Southern Texas and Mexico through Central America to Northern South America
• Habitat: Open and semi-open country, brushy fields, and pastures
• Social Structure: Highly Social, Communal Breeders
• Nesting/Breeding: Communal cup nest in dense trees or thorny bushes
• Conservation Status: Least Concern (LC)
• Population Trend: Decreasing

Distinctive and charismatic, the Groove-billed Ani (*Crotophaga sulcirostris*) is a medium-sized member of the cuckoo family easily identified by its coal-black plumage and exceptionally long, floppy tail. Its most defining feature is its massive, high-arched bill, which is etched with unique horizontal grooves that give the species its name and a somewhat prehistoric silhouette. Beyond its striking appearance, this tropical bird is known for its fascinatingly social nature; they live in close-knit groups and practice communal nesting, where several females lay their eggs in a single, shared nest and the entire group assists in raising the young. Often found in open pastures or scrublands following livestock to snatch up stirred-up insects, the Groove-billed Ani moves with a distinctive, somewhat clumsy flight and a variety of liquid, whistling calls that make it a quirky and unmistakable presence in its habitat.

Fun Facts

These birds are masters of communal living, with up to five pairs sharing a single "apartment-style" nest where females often engage in a sneaky game of egg-tossing to displace a rival’s eggs before laying their own. Despite their social nature, they are notoriously weak fliers, utilizing a clumsy "flop-and-glide" technique that makes them appear perpetually off-balance. They are frequently seen hitching rides on the backs of cattle to snatch up flushed insects, and they possess a surprisingly pungent, musky body odor. Unusually for birds, the males take on the bulk of the nighttime incubation duties, guarding the communal clutch while the females rest.

Habitats & Distribution

This species inhabits a variety of open and semi-open landscapes, including scrublands, pastures, orchards, and forest edges. It is particularly common in brushy thickets and second-growth forests, often favoring areas near water or sites where livestock are present. While it avoids dense, unbroken forests, it thrives in human-altered environments and agricultural mosaics from sea level up to mid-level elevations. Its geographical range extends from the southern tip of Texas and coastal Mexico through Central America into South America, reaching as far as Peru, northern Chile, and parts of Venezuela. While most populations are permanent residents, those at the northernmost edge of the range may move southward during the winter months. Occasionally, individuals are recorded as vagrants further north in the United States.

Behaviours & Reproduction

Highly social and cooperative, these birds live in small groups composed of several monogamous pairs that share a single territory. Their reproductive strategy is defined by communal nesting, where all females in the group deposit their eggs into one large, shared nest. This social structure extends to the care of the young, as all group members participate in defending the site and providing food. Daytime incubation is shared among the adults, but the dominant male typically assumes the role of incubating the eggs throughout the night. A unique and competitive aspect of their reproduction is the practice of egg-tossing. Before the full clutch is established, females often push the eggs of their group mates out of the nest. This behavior continues until the female responsible for the tossing begins her own laying cycle, at which point the group transitions to synchronized laying. This strategy ensures that the final brood consists of eggs that will hatch around the same time, allowing the communal group to focus their collective efforts on raising a single, synchronized set of offspring.

Diet

The Groove-billed Ani maintains a diverse diet primarily composed of large insects such as grasshoppers, beetles, and caterpillars, though it also opportunistically consumes small vertebrates like lizards and frogs, as well as various fruits, berries, and seeds. One of the most fascinating aspects of its foraging behavior is its commensal relationship with livestock; these birds frequently follow grazing cattle and horses to snatch up insects flushed from the vegetation by the animals' movement. Additionally, they are known to follow swarms of army ants to capture displaced prey and have occasionally been observed picking ticks and other parasites directly off the hides of cattle. This social forager typically hunts in small groups, using a variety of techniques including gleaning insects from foliage and making short flights to capture prey on the ground.

Colors

The Groove-billed Ani is entirely black with a subtle iridescent sheen of purple and green on its wings and long tail. Its plumage features silvery-grey feather edges on the head and neck, creating a distinct scaly pattern. The most characteristic feature is its massive, black, curved bill, which is uniquely marked with several deep longitudinal grooves.