Four-legged animals first stepped onto land approximately 395 million years ago.
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It seems that our hips have fishy origins. A study from researchers at Monash University has shown that the evolution of the complex hips of walking animals from the basic hips of fish was much more straightforward than previously thought.
Four-legged animals first stepped onto land approximately 395 million years ago. This major change was only made possible by strong hipbones and a connection through the spine via an ilium. These features were not present in the fish ancestors of tetrapods.