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Crabs evolved their body shape at least five separate times — but the sideways walk happened exactly once
There are roughly 7,000 species of true crabs on Earth, and nearly all of them scuttle sideways. That quirky gait is so universal it seems inseparable from being a crab. But a growing body of research ...
Long before vertebrates moved to land, a study finds, some organisms moved with asymmetrical gaits. By Sam Jones Cheetahs are the fastest animals on land, clocking in at speeds over 60 miles per hour.
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