Collared Forest-Falcon

Micrastur semitorquatus

The collared forest falcon is a species of bird of prey in the family Falconidae. It is the largest member of the Micrastur genus and a common inhabitant of tropical rainforests in Latin America. Hiding in the dense forest canopy, they are a secretive bird often only recognized by their distinctive call. With a morphology or body type allowing them to be agile in their forested habitat, their diet comprises a wide variety of prey from smaller frogs to adult turkeys (2.7-3.2 kg). Source

Where it is now

In the last 8 weeks this bird was recorded 8,170 times across 23 areas (each area is a 5 degree square).

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Movement and weather

Each season it is first heard regularly where daytime highs are around 30°C (typically 28 to 32°C, from 8 areas). That holds across 40° of latitude, which suggests its timing follows temperature more than the calendar.

Over the weeks it was present in the past year, its centre in South America ranged from 22°S in March to 5°N in December, about 3,100 km apart.

Arrival dates

The week it was first heard regularly in each region, after at least six weeks away. Dates differ from south to north, so a region has a range.

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Figures are effort corrected and come from automatic sound identification, which makes mistakes. How this is measured and how it compares with human observers.