Rufous-thighed Kite

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Quick Facts

  • Scientific Name: Harpagus diodon
  • Spanish Name: Elanio de los arrozales
  • Family: Accipitridae
  • Known Nicknames: Rufous-thighed Hawk, Rufous-thighed Harpagus
  • Average Length: 30–35 cm / 12–14 in
  • Average Weight: 190–230 g / 6.7–8.1 oz
  • Wingspan: 60–75 cm / 24–30 in
  • Key Feature: Rufous thighs and underwing coverts contrasting with white underparts
  • Primary Diet: Carnivore (insects, small birds, reptiles, and amphibians)
  • Range: Eastern and southern Brazil, Paraguay, northeastern Argentina, and eastern Bolivia
  • Habitat: Lowland tropical and subtropical forests, forest edges, and gallery forests
  • Social Structure: Solitary or in pairs
  • Nesting/Breeding: Tree nest, often in a fork of a branch, built of sticks
  • Conservation Status: Least Concern (LC)
  • Population Trend: Stable

The Rufous-thighed Kite (*Harpagus diodon*) is a small, sleek raptor of South American forests, named for its most distinctive feature: a rich, chestnut-rufous patch on the inner wing linings and thighs that flashes vividly in flight. Generally, it presents a neat, dark gray back and head contrasting with a clean white throat and breast, often barred with fine gray on the belly. A special and unique characteristic is its double-toothed beak—a notch on the upper mandible that gives this kite its genus name *Harpagus* (meaning "ravisher") and aids in gripping slippery prey like lizards and large insects. Despite its fierce name, this agile hunter is more often seen gliding gracefully above the canopy or perched quietly, its bright yellow eyes and the subtle rufous accents making it a captivating gem among Neotropical birds of prey.

Fun Facts

Despite its name, the rufous-thighed kite’s most striking feature is its bright orange-red thighs, which it often flashes during aggressive displays against other birds or when defending a perch. It has a peculiar hunting habit of snatching large insects, lizards, and even small birds directly from foliage while hovering briefly, a technique more common in kestrels than kites. Another quirky behavior is its tendency to “ant,” or rub crushed ants into its feathers, likely using the formic acid as a natural insecticide to ward off parasites. It also possesses an unusually large, hooked beak relative to its body size, allowing it to decapitate prey with a single, swift bite—a surprisingly violent move for a bird that often looks like a gentle forest dweller.

Habitats & Distribution

The Rufous-thighed Kite inhabits lowland and foothill tropical forests, including both primary and mature secondary growth, often near rivers or clearings. It is also found in forest edges, plantations, and semi-open woodlands, but generally avoids dense, unbroken canopy interiors. Its geographical range extends across a large portion of South America east of the Andes, from eastern Colombia, Venezuela, and the Guianas south through much of Brazil, eastern Peru, Bolivia, Paraguay, and into northeastern Argentina. It is resident throughout most of this range, though some seasonal movements may occur in the southernmost populations.

Behaviours & Reproduction

The Rufous-thighed Kite is generally solitary or observed in pairs, with a social structure centered on a monogamous bond during the breeding season. Mating habits involve aerial displays where the male performs undulating flights and calls to attract a female, followed by mutual perching and preening. Reproduction is notable for its reliance on the abandoned stick nests of other birds, such as those of larger hawks or oropendolas, rather than building its own. The female typically lays 2–3 eggs, and both parents share incubation duties for about 30 days, with the male providing food. A unique strategy is their frequent use of nests in close proximity to aggressive wasp or ant colonies, which likely offers protection from nest predators like snakes and monkeys.

Diet

The Rufous-thighed Kite is an insectivorous and carnivorous raptor with a highly specialized diet centered primarily on large insects, particularly Orthoptera such as grasshoppers, crickets, and katydids, which it often catches in mid-air or plucks from foliage. It also preys on small vertebrates like lizards, frogs, and occasionally small birds or rodents, but insects make up the bulk of its intake. A fascinating aspect of its feeding behavior is that it frequently follows army ant swarms in the forest understory, snatching fleeing arthropods and small animals flushed by the ants, a strategy known as "ant-following" that is more commonly associated with certain birds like antbirds. Additionally, it has been observed taking small snakes and even feeding on fruits or berries on rare occasions, though this is likely supplemental to its primary protein-rich diet. The kite often hunts from a low perch, making quick sallies to capture prey, and it sometimes consumes its food while perched, using its sharp talons to hold and tear apart larger items.

Colors

The Rufous-thighed Kite has a gray head, back, and upper chest, with a white throat and lower underparts. Its most distinctive feature is the rich rufous or chestnut-colored thighs and lower belly, which contrast sharply with the pale body. The tail is dark with narrow white bands, and the eyes are red. It lacks specific camouflage adaptations, relying instead on its small size and forest canopy habitat for concealment.

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