Whistling Duck, Dendrocygna viduata. This adorable little duck is native to South America and Central Africa. It's named for this adorable, distinctive, tri-part, high-pitched whistle that I cannot quite figure out how to describe in words (but I could whistle it for you, given half a chance!). Two short trills followed by a longer trill that descends in frequency. I've never heard one quack, just whistle. They seem quite sociable and prolific and are cute to boot as well.
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