This is walking out from your feet with your hands, keeping your bottom high in the air and edging your feet back towards your hands and repeating so that you are making (very slow) progress ...

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They had that flat crabby shape, a small abdomen, and a bunch of walking legs just like today’s crabs. It wasn’t until the early Jurassic period, tens of millions years after the first ...

Walking sideways means that one leg never moves into the path of another, so a crab is less likely to trip over its feet ...