fromwww.scientificamerican.com
8 hours agoBird Migration Is One of Nature's Greatest Spectacles. Paleontologists Just Found Clues to Its Origin
The Arctic Tern is not the only bird that spends its breeding season in the Arctic. Billions of birds belonging to nearly 200 speciesfrom small sparrows such as the Smith's Longspur to large waterfowl such as the Greater White-fronted Goosemake their way to the far north every spring to reproduce and then make the return flight south for the winter.
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