Red Knots: A Tiny Bird’s Massive Migration

Bird migrations defy human understanding. Every year, for example, Adélie penguins trek more than 8,000 miles following the Antarctic ice coast as it expands then contracts. This distance isn't unusual as far as bird migrations go but the thing is, the penguins wobble all that way on foot. Here's another example: sooty shearwaters migrate in …

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