Milan bec-en-croc

En bref

• Scientific Name: Chondrohierax uncinatus
• Spanish Name: Milano picogarfio
• Famille : Accipitridae
• Known Nicknames: None widely used
• Longueur moyenne : 38–51 cm / 15–20 pouces
• Average Weight: 215–397 g / 7.6–14 oz
• Wingspan: 80–98 cm / 31–39 in
• Key Feature: Deeply hooked, oversized bill and broad, paddle-shaped wings
• Primary Diet: Malacivore (Primarily tree snails)
• Range: Southern Texas (Rio Grande Valley) through Mexico and Central America to South America and Grenada
• Habitat: Subtropical and tropical forests, woodlands, and riparian thickets
• Structure sociale : Solitaires ou en couples
• Nesting/Breeding: Shallow stick nests in trees
• Statut de conservation : Préoccupation mineure (LC)
• Évolution démographique : En baisse

The Hook-billed Kite (*Chondrohierax uncinatus*) is a distinctive Neotropical raptor celebrated for its extraordinary, oversized beak and specialized lifestyle. This medium-sized hawk is most famous for its massive, deeply hooked bill, a precision tool evolved specifically for extracting tree snails from their shells. Remarkably polymorphic, the kite appears in a bewildering variety of color phases, ranging from slaty gray and barred rufous to a rare, entirely sooty-black morph, all of which feature a striking patch of lime-green or yellow bare skin between the eye and the bill. In the air, it is easily identified by its broad, paddle-shaped wings and a unique, somewhat "floppy" flight style, making this elusive snail-specialist one of the most unusual and captivating birds of prey in the Americas.

Faits amusants

The Hook-billed Kite is a specialized snail hunter with a remarkably heavy, deeply hooked beak designed specifically to extract tree snails from their shells without shattering them. This bird displays an extraordinary level of bill size polymorphism, where individuals in the same population can have drastically different beak dimensions to exploit various snail species. Beyond their specialized toolkit, they are masters of disguise, exhibiting one of the most variable plumage ranges of any raptor, appearing in gray, rufous, or nearly black morphs. Unlike many high-soaring hawks, they are known for their somewhat sluggish nature, often spending long periods sitting quietly in the canopy or flying with distinctive, paddle-shaped wings.

Habitats et répartition

This raptor inhabits a variety of humid tropical and subtropical environments, including lowland forests, mangroves, and gallery forests along riverbanks. It is most frequently found in areas with dense foliage that support large populations of arboreal snails, its primary food source. While it prefers moist habitats, it can also be found in drier deciduous woodlands and secondary growth forests, ranging from sea level up to mid-elevation montane regions. Its geographical range spans from the Rio Grande Valley in southernmost Texas through Mexico and Central America into South America. On the South American continent, it is widespread east of the Andes, extending as far south as northern Argentina and Uruguay. Additionally, a distinct and rare subspecies is resident on the Caribbean island of Grenada, though the species overall remains localized throughout much of its northern distribution.

Comportements & Reproduction

These kites are primarily solitary or found in pairs, often characterized by a lethargic temperament as they spend long periods perched quietly while hunting for tree snails. During the breeding season, they form monogamous pairs and engage in soaring aerial displays to maintain their bonds. While generally not highly social, they lack strong territoriality and may occasionally forage in loose proximity to one another when food sources are concentrated. Reproduction typically occurs in a fragile, shallow platform nest constructed of thin twigs and sticks, usually positioned high in the forest canopy. Both parents participate in the incubation of the two to three eggs and share the responsibility of feeding the nestlings. A notable trait of the species is its extreme bill size polymorphism; while this variation is primarily an adaptation for specialized feeding, it ensures that local populations can efficiently exploit diverse snail species without direct competition between individuals within the same breeding area.

Alimentation

The Hook-billed Kite is a highly specialized raptor whose diet consists primarily of arboreal snails, particularly those from the genera Liguus and Drymaeus. To facilitate this unique food preference, the bird has evolved a remarkably large, deeply hooked beak that it uses to expertly extract the soft bodies of snails from their hard shells by prying or breaking the operculum. An intriguing aspect of their feeding ecology is the significant variation in bill size among individuals, a trait known as bill polymorphism, which allows different populations to specialize in the specific sizes of snails available in their local habitats. While snails are their mainstay, these kites are opportunistic enough to supplement their intake with other small prey such as frogs, salamanders, lizards, and large insects when their primary food source is scarce.

Couleurs

The Hook-billed Kite is highly polymorphic, featuring plumage that ranges from slaty-gray in males to brownish with rufous collars in females, typically marked by heavy barring on the underparts. A rare melanistic morph appears entirely sooty-black. Key identifiers include a massive hooked bill, pale irises, and greenish-yellow facial skin, while their broad, rounded wings display bold dark-and-light banding underneath for camouflage against the sky.

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