The Chopi Blackbird (*Gnorimopsar chopi*) is a striking South American songbird, easily recognized by its entirely glossy black plumage that shimmers with a subtle blue or purple sheen in good light. Slightly larger than a common grackle, it possesses a uniquely thick, conical bill with a distinctive pale bluish-white base on the lower mandible, a feature that sets it apart from other blackbirds. Its most remarkable trait, however, is its extraordinary vocal ability: the Chopi Blackbird is a master mimic, capable of flawlessly imitating the calls of over a dozen other bird species, as well as sounds like barking dogs, human whistles, and even chainsaws. This vocal prowess, combined with its habit of perching conspicuously on wires or fence posts, makes it both a charismatic and unforgettable presence across its grassland and savanna habitats.

Faits amusants

The Chopi Blackbird is a master of vocal mimicry, capable of flawlessly imitating other bird species, human whistles, and even mechanical sounds like camera shutters or cell phone ringtones. It has a unique feeding adaptation: instead of just probing with its beak, it often uses its strong feet to hold down large insect prey or fruit while tearing it apart. One quirky behavior is its habit of perching on cattle or capybaras, not for transportation, but to snap up the insects flushed by the animal’s movement, acting as a living, feathered pest control. Males are also known to perform a bizarre "dance" during courtship, hopping sideways with their wings drooped and tail fanned, sometimes while holding a twig or leaf in their beak.

Habitats et répartition

The Chopi Blackbird inhabits a variety of open and semi-open landscapes, primarily in lowland regions. It is commonly found in savannas, grasslands, pastures, agricultural fields, and areas with scattered trees or gallery forests, often near water sources like rivers or marshes. It avoids dense, humid forests but adapts well to human-modified environments such as ranches and rural gardens. Its geographical range spans central and eastern South America, including much of Brazil (from Maranhão and Piauí south to Rio Grande do Sul), eastern Bolivia, Paraguay, northern Argentina, and Uruguay. It is generally resident and common throughout this range, though its distribution can be patchy in more arid or heavily forested zones.

Comportements & Reproduction

The Chopi Blackbird exhibits a complex social structure, often forming small flocks outside the breeding season but becoming highly territorial during reproduction. Males establish and defend nesting territories, using loud, varied songs to attract females and deter rivals. Mating is typically monogamous within a season, though extra-pair copulations may occur. A unique reproductive strategy is their reliance on constructing cup-shaped nests in tree cavities or abandoned woodpecker holes, which they line with soft plant material. Females lay 2-4 pale blue eggs with dark speckles, and both parents share incubation duties for about two weeks. After hatching, the chicks are altricial and are fed by both adults, fledging after approximately 18-21 days. Unlike many blackbirds, they do not exhibit brood parasitism, but they aggressively defend their nests from predators and other birds, occasionally engaging in cooperative mobbing.

Alimentation

The Chopi Blackbird is primarily an omnivorous forager, with a diet heavily centered on insects and other arthropods, especially during the breeding season when protein demands are high for chicks. It actively searches for beetles, grasshoppers, caterpillars, and spiders by probing the soil and leaf litter with its strong, pointed bill. Interestingly, this bird has a well-documented habit of following army ant swarms, expertly capturing insects and small invertebrates that flee from the ants’ advance, a behavior that puts it in direct competition with army-ant-following species like antbirds. Additionally, it consumes a significant amount of fruit and seeds, including those from palm trees and cultivated crops like corn and rice, often foraging in small flocks in agricultural fields. The Chopi Blackbird is also known to occasionally take small vertebrates such as frogs and lizards, and it has been observed engaging in rare kleptoparasitism, stealing food items from other birds like the Guira Cuckoo.

Couleurs

The Chopi Blackbird is predominantly glossy black with a subtle steel-blue or purplish iridescence on its head, back, and wings. Its most distinctive feature is the bare, wrinkled yellow-orange skin around the eye and at the base of the lower mandible, contrasting sharply with the dark plumage. It lacks any cryptic patterns or camouflage adaptations, as its uniform dark coloration and open-habitat foraging rely on social behavior rather than concealment.