White-crowned Sparrow by Keith Kennedy / Macaulay Library. Updated May 2026; first published April 2008. Twice a year billions of birds take to the skies as they migrate to and from their summer and winter homes (or breeding and nonbreeding grounds). And every year birders delight in seeing these old friends return after navigating untold challenges and hundreds or even thousands of miles along the way. But how do the birds manage to find the pl…
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