John James Audubon described a single flock of ____of perhaps a billion birds,which took 3 days to travel past him and darkened the skies.

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Only passenger pigeons were known to gather in large flocks of up to a billion birds, and Audubon was famously witness to one of these flocks in the 19th century. The other options either do not gather in such large flocks or were not present in the same region as Audubon.

John James Audubon Described a Single Flock of ____Of Perhaps