Biologists uncovered why so many animals evolve into crabs but only true crabs walk sideways

The process of carcinisation, evolution of crabs, sideways movement, crustaceans, convergent evolution and decapods and true ...
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Everything may be evolving into crabs, but their sideways walking only emerged once

It is a truth universally acknowledged that everything eventually evolves into a crab. Not quite everything, of course, but ...