Birding Inirida, Colombia, or river dolphins and hoatzins, part 2
10,000 Birds
DECEMBER 30, 2021
One of this species’ many peculiarities is that it has a digestive system unique amongst birds: Hoatzins use bacterial fermentation in the front part of the gut to break down the vegetable material they consume, much as cattle and other ruminants do. We found Black-collared Swallows breeding in cracks among the lower riverside rocks.
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