John James Audubon described a single flock of ____ of perhaps a billion birds, which took three days to travel past him and darkened the skies.

Question

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John James Audubon is known for his extensive work studying and drawing birds, including the passenger pigeon. The passenger pigeon was once the most numerous bird in North America, with flocks that could number in the billions. However, human activities such as habitat destruction and excessive hunting led to their rapid decline, and the last known passenger pigeon died in 1914. Therefore, based on Audubon's description, the correct choice is D, passenger pigeons.

John James Audubon Described a Single Flock of ____ of Perhaps