Not that long ago, Passenger Pigeons filled the skies.
Some flocks, with more than a billion birds, took four days to pass overhead.
Aldo Leopold called the pigeon “a biological storm.”
Early explorers and settlers frequently mentioned Passenger Pigeons in their writings.
Samuel de Champlain in 1605 reported "countless numbers."
Yet by the early 1900s, no wild Passenger Pigeons could be found. Now they are extinct, gone forever from our world.
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