Posted by: Sandy Steinman | April 21, 2019

How Many Birds Disappear Between Migration Seasons?

Audubon Magazine reports New research has found that a third of the avian population that winters in the mainland United States might not survive till spring. But

Each fall, billions of birds like the robin and tanager make their way to the Lower 48 or to the tropics. But a big slice of them never flies back—casualties of natural causes like weather and predation, and unnatural causes like oil pits, feral cats, and glass collisions. Now scientists from the Cornell Lab of Ornithology in Ithaca, New York, have put a first-ever estimate on those missing travelers.

Read article at How Many Birds Disappear Between Migration Seasons? We Now Have a Clue. | Audubon

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