These Crows Evolved Into A New Species, Boned The Old Species Too Much, Now Back Where They Started
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Hundreds of thousands of years ago, a glacier advanced upon the Pacific Northwest, its ice forming a natural barrier that fractured crows into two populations. These populations began to diverge into two separate species, which ornithologists decided were distinguishable by small differences in body measurements and the sounds they made. At least, that’s what they thought.

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