Bicolored Hawks

Description

The Bicolored Hawk, an Accipiter native to the Neotropics, is a large bird. The adult ranges from 34 to 45 centimeters, and females are typically bigger and heavier than the males. The plumage of this bird is variable. Above, it has slate-gray feathers or darker gray, particularly on the crown and wings, whereas the tail is broad-banded. Its thighs are always rufous, a reddish-rust colour. However, their visibility can vary depending on lighting and posture.

Underparts can vary according to subspecies or location. In the northern part of the range, the birds are often pale gray, while in the south, the subspecies sometimes known as “Chilean Hawks” have rufescent underparts. The juveniles are more variable than adults: they can have buff or white underparts or be streaked with darker markings. They may also have browner upperparts and a duller contrast.

The soft parts (legs and feet) are yellow. The bill is hooked, as it would be in a hawk. Overall body proportions have been designed for maneuverability between trees, rather than long glide flight. Its tail is long and its wings are rounded, which helps it to maneuver in dense forest terrains where quick turns and bursts of speed are important.

Distribution and Habitat

Bicolored Hawks are found in a large area of Central and South America, including southern Mexico, Central America, and parts of central, northern, and eastern South America. In some taxonomies, its southernmost populations extend to northern Argentina, Paraguay, and Bolivia. Parts of Chile are also included in this range (although the Chilean subspecies can be treated as a distinct species). It is found in lowland and mid-elevation forests.

The habitat preference is for wooded areas, such as rainforests, humid forest edges and gallery forests, riparian forests, woodland, and, sometimes, plantations. The Bicolored Hawk tolerates some disturbance and nests and hunts in secondary forests or forest edges. However, it is most abundant when the forest cover is intact. Bicolored Hawks are less common in fragmented forests, heavily logged areas, and landscapes with steeply declining forest cover.

It avoids truly open habitats, preferring instead dense undergrowth, tall trees, shaded openings, and forest margins with a canopy structure. The raptor is also found near rivers and watercourses, which provide both good cover and prey. It is rare in arid zones with little to no forest, except for patches of suitable forest.

Feeding

Its hunting style is based on surprise and stealth, rather than soaring overhead. It perches among the branches and watches, before darting out to ambush small animals, birds, reptiles, or insects. It may use rapid, agile flight to fly through dense foliage or wait near the forest edge for prey movements.

Its diet is dominated by birds such as thrushes and doves. It has been observed to eat insects, reptiles, and small mammals. It has been observed to follow monkeys and other animals in some instances, perhaps to capture prey that is flushed by their movements. This behavior is indicative of opportunism – a trait that predators in forest environments can use to their advantage. According to Audubon Society, this species is well documented.

This hawk’s keen vision, stealth, and ability to move quickly in undergrowth are key assets because prey visibility can be limited in forests. It is possible to increase your chances of success by hunting at dawn or dusk, when the light levels are lower. Also, prey may be less alert. According to BirdLife International, this species is well documented.

Vocal Behavior 

Bicolored Hawks are not known for their loud and dramatic calls. However, they have a distinctive vocal repertoire that is both informative and distinct. The males emit a soft, clear whistling sound, while the females make louder “cac cac cac” sounds, especially when they are near nests and young. Both sexes produce barking or rough calls like “kra-kra-kra-kr-kr-kr-ka,” especially when disturbed.

The male may make a “kek” noise when returning with food to the nest, while the female will respond with a nasal, “wreh.” This exchange is used to coordinate breeding behaviors, to signal presence, or to reassure young and mates. Apart from these breeding season or disturbance-triggered calls, the Bicolored Hawk is often very quiet and difficult to detect by sound alone.

Breeding and Nesting

Breeding occurs primarily in forests. The nests are built by pairs on branches of trees and sometimes from vines. The nests are often located high up in the canopy of older trees, which provide both protection and visibility from predators. Nest building is preceded by courtship, in which both sexes are involved in nest construction and feeding.

The clutch size can vary from one egg to three, depending on the region and weather conditions. The eggs are dull and often whitish. They may also have light spots or warm tones. Incubation lasts approximately three weeks after laying (about 20-23 days in some populations). During this time, the female is responsible for brooding, and the male provides food. The chicks are semialtricial, meaning that they may have opened their eyes at hatching, but are still dependent on the parents for food, shelter, and protection.

The young will continue to feed at the nest several weeks after the fledging. During this time, parents spend extended hours caring for, hunting, and protecting their chicks. The survival of chicks is heavily dependent on nest location, disturbance level, predation, and food availability.

Conservation Threats and Status

IUCN has classified the Bicolored Hawk as ” Least Concern. This is largely due to its large population and very wide range (tens or millions of square kilometers). The trend appears to be a slow decline in many areas, which is linked to habitat destruction, forest fragmentation, and human disturbance. Although not threatened globally under IUCN criteria yet, local populations may be seriously affected (especially in heavily disturbed or fragmented forests).

Deforestation, logging, conversion to pasture or farmland, infrastructure development, and loss of riparian areas are the primary threats. The fragmentation of forests reduces the availability of prey, nesting sites, and cover. As forest habitats decline or become degraded, the threat of competition from other predatory species and disturbance by humans (birds being flung, nest disturbances) increases.

It is important to prioritize conservation efforts that promote the preservation of large, connected forests, the protection of riparian strips, the maintenance of mature trees, and the management of disturbed areas. Community awareness, the enforcement of forest protection legislation, and the incorporation of habitat preservation into land-use planning can also help to buffer population declines.

Conclusion

The Bicolored Hawk does not dominate the skyline. It is a creature that lives in the shadows of the forest and is subtle. The existence of the Bicolored Hawk is a testament to the complexity and diversity of tropical forests, where predators as well as prey need cover. It is not endangered, but it’s not invulnerable either. Because of its dependence on intact forests and sensitivity to disturbance, this species should be closely monitored.

The Bicolored Hawk’s stealth, its soft call, and the way it builds a nest among the branches invite reflection on the importance of ecosystems, prey abundance, unbroken canopies, and people respecting them. Birdwatchers love to spot them, but conservationists see each hawk as a part of the forest’s resilience. The Bicolored Hawk is more than just a species. It’s about preserving the forest landscapes of Central and South America.