Gray-lined Hawk

Quick Facts

  • Scientific Name: Buteo nitidus
  • Spanish Name: Gavilán gris
  • Family: Accipitridae
  • Known Nicknames: Gray Hawk, Grey-lined Hawk
  • Average Length: 38–48 cm / 15–19 in
  • Average Weight: 400–600 g / 14–21 oz
  • Wingspan: 86–102 cm / 34–40 in
  • Key Feature: Pale gray head and breast with fine white barring on belly and thighs
  • Primary Diet: Carnivore
  • Range: Southwestern United States to northern Argentina
  • Habitat: Riparian woodlands, gallery forests, and tropical dry forests
  • Social Structure: Solitary or in pairs
  • Nesting/Breeding: Stick nest in a tree fork
  • Conservation Status: Least Concern (LC)
  • Population Trend: Stable

The Gray-lined Hawk (*Buteo nitidus*) is a sleek, medium-sized raptor of Neotropical lowlands, easily distinguished from its larger *Buteo* cousins by its compact build and striking, fine gray-and-white barring across the chest and belly. Its general appearance is a study in subtle contrast: adults display pale gray heads and upperparts, with a boldly banded black-and-white tail and vivid yellow cere and legs, while juveniles are a rich brown above with heavy streaking below. A special feature is its exceptionally agile hunting style—it often glides just above the canopy or perches quietly to ambush lizards, birds, and small mammals, but it is also one of the few hawks known to actively follow army ant swarms to snatch fleeing prey. Despite its wide range from Costa Rica to Argentina, this secretive bird remains less studied than its flashier relatives, making every sighting a rewarding encounter for birders exploring forest edges and clearings.

Fun Facts

Despite its name, the Gray-lined Hawk isn't always strictly gray; juveniles sport a striking, heavily streaked brown and white pattern that looks completely different from the adults' crisp barred chest, a classic example of delayed plumage maturation. One quirky behavior is its fondness for following army ant swarms, not to eat the ants, but to snatch the panicked insects, lizards, and small mammals fleeing the chaos. It also has a surprisingly delicate hunting technique for a raptor, often dangling upside down from branches to pluck fruit or grab prey from crevices, a skill more common in forest-dwelling accipiters than in its open-country buteonine cousins.

Habitats & Distribution

The Gray-lined Hawk inhabits a variety of lowland tropical and subtropical environments, primarily within dry to semi-humid forests, gallery forests, and woodland edges. It is also found in savannas with scattered trees, agricultural areas with remnant vegetation, and sometimes mangroves or coastal woodlands, generally avoiding dense, humid rainforest interiors. Its geographical range extends from northwestern Costa Rica in Central America, through Panama, and then across much of northern and central South America, including Colombia, Venezuela, the Guianas, Ecuador, Peru, Bolivia, and Brazil, reaching as far south as northern Argentina and Paraguay.

Behaviours & Reproduction

The Gray-lined Hawk is generally solitary or seen in pairs, especially during the breeding season. Mating pairs are monogamous and likely maintain a long-term bond, with courtship involving aerial displays where the male may dive and call to the female. The pair builds a stick nest high in a tree, often reusing and adding to the same nest over multiple years. The female typically lays one to three eggs, and both parents share incubation duties, though the female does most of the sitting while the male provides food. After hatching, the male continues to hunt for the female and chicks, and the young fledge after roughly six weeks but remain dependent on the parents for several more weeks. A unique strategy is their preference for nesting near water or in riparian zones, which may reduce predation risk and ensure a steady supply of prey like lizards and small birds for the growing chicks.

Diet

The Gray-lined Hawk is a carnivorous raptor whose diet consists primarily of small to medium-sized reptiles, particularly lizards and snakes, along with birds, small mammals like rodents, and occasionally large insects such as grasshoppers and beetles. An interesting fact about its feeding behavior is that it often hunts from a concealed perch within the forest canopy, using a swift, direct flight to surprise prey on the ground or in trees. Unlike some other buteos that rely heavily on soaring, this hawk frequently stalks prey by hopping or walking along branches, and it has been observed raiding bird nests for eggs and chicks. Additionally, its diet can shift seasonally in response to prey availability, with a higher intake of insects during the wet season when they are abundant.

Colors

The adult Gray-lined Hawk has a pale gray head and chest, with fine, dark horizontal barring across the belly and flanks, giving a "lined" appearance. Its back and wings are solid gray, while the tail is black with a single broad white band and a narrow white tip. Juveniles are brown above with a heavily streaked breast and belly, and a dark-banded tail. Its gray plumage provides camouflage against the open, dry forests and savannas it inhabits, blending with the dappled shade and muted sky.