Keeping common birds common is as important as preventing extinctions of rare species.
Yet, the songbird species in this sound collection have lost more than half of their population over the past four decades.
Hear these species now:
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Bank Swallow
Blackpoll Warbler
Cape May Warbler
Eastern Meadowlark
Field Sparrow
Grasshopper Sparrow
Horned Lark
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Lark Bunting
Loggerhead Shrike
Pine Siskin
Snow Bunting
Varied Thrush
Verdin
Wilson's Warbler
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