Every autumn, tiny forest songbirds known as blackpoll warblers fly 1,500 miles nonstop from New England and Canada to Puerto Rico, Cuba and the Greater Antilles. The journey, long suspected but only now documented, is one of the longest overwater flights made by a songbird. Recording the migration was a challenge because of the tiny size of the birds, which typically weigh about half an ounce. In a study published in the journal Biology Letters, researchers attached miniature geolocators about the size of a dime to the backs of 40 warblers to confirm the migration route.
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