Broad-winged Hawk

Overview

The broad-winged hawk (Buteo platypterus) is a compact forest buteo most famous not for what it does in one place, but for what it does in the air over Central America each autumn. The species stages one of the most spectacular raptor migrations in the world — millions of individuals condensed into a narrow corridor, soaring on thermals in swirling columns called kettles that can contain tens of thousands of birds in a single day at bottleneck sites.

Adults are solidly built with a dark brown back, pale underparts with rusty barring on the breast, and a tail with two or three broad black-and-white bands — the tail pattern is the field mark at distance. In flight, the wings appear short and broad with a rounded tip. Juveniles are streaked and lack the clean tail bands.

Why Tortuguero

The Caribbean lowland corridor — of which Tortuguero is a part — is one of the routes used by broad-winged hawks moving south in autumn. The birds travel roughly 100 km per day, using thermals to gain altitude and then gliding toward the next thermal column, converting altitude into ground distance without flapping. At peak passage, hawks that have been funneled by the mountain ranges into the coastal strip may appear as huge kettles spiraling overhead.

For a park visitor in late September or October, a morning with good thermal conditions can produce a sighting of hundreds of raptors kettling over the treeline — a dramatic natural spectacle that costs nothing extra to witness from any open viewpoint.

How to see them (honestly)

• Migration season is the window: September–November southbound, March–April northbound. Outside those months the species is essentially absent from Tortuguero.
• Watch during mid-morning (9 AM–noon) when thermals are strongest; broad-winged hawks don’t flap cross-country — they kettle on rising air.
• Any elevated open viewpoint — the beach, the village airstrip clearing, the top of a canal bank — gives a wider sky view than the enclosed canal system.
• Individual birds perch in forest interior during the breeding season, but in Tortuguero the spectacle is always aerial.

Status note

Least Concern globally, with overall numbers apparently stable and possibly increasing despite localized breeding-range declines from forest fragmentation. The migratory habit makes populations difficult to monitor precisely, but counts at known bottleneck sites (e.g., Veracruz, Mexico) suggest the species remains abundant. No specific conservation concerns for Tortuguero.