Black-bellied Whistling Duck

Dendrocygna autumnalis

The black-bellied whistling duck or black-bellied tree duck, is a whistling duck that before 2000 bred mainly from the southernmost United States to south-central South America. It can be found year-round in much of the United States. It has been recorded in every eastern state and adjacent Canadian province. Since it is one of only two whistling duck species native to North America, it is occasionally just known as the "whistling duck" or "Mexican squealer" in the southern USA. Source

Where it is now

In the last 8 weeks this bird was recorded 186,538 times across 26 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 28°C (typically 27 to 29°C, from 6 areas). That holds across 30° 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 North America ranged from 17°N in June to 29°N in April, about 1,300 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.