Bird

Alaska Department of Fish and Game photo

Biologist Julie Hagelin holds an olive-sided flycatcher that helped her with a recent study.

Right about now, songbirds in Brazil are shifting on their perches, feeling mysterious impulses that will soon make them leap off their branches and head toward Alaska.

One of these birds is the olive-sided flycatcher, about as tall as your hand, with a blocky body and head. With good fortune, these birds will in a few months be fluttering into a forest swamp in Alaska, Canada or the Rocky Mountains, with a mission of replicating.

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