by Greg Mayer The four-legged land vertebrates– amphibians, reptiles, birds, and mammals, collectively known as tetrapods– get around, at least mostly, on their four legs. Their front a…
Source: A fish with hips
by Greg Mayer The four-legged land vertebrates– amphibians, reptiles, birds, and mammals, collectively known as tetrapods– get around, at least mostly, on their four legs. Their front a…
Source: A fish with hips
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