Why dinosaurs and humans both have a radius and ulna

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A few days ago I got to see Apex, which is thought to be the largest and one of the most complete stegosaurus specimens ever uncovered.  I am sure that most museumgoers had the same reaction I had, which was a sense of profound wonder at the fact that the stegosaurus (and indeed nearly all dinosaurs) had a radius and ulna below the elbow of each forelimb, exactly like humans (and nearly all mammals), and had a tibia and fibula below the knee of each hindlimb, again exactly like humans.

Given that dinosaurs and mammals are different branches of the evolutionary family tree, separated for tens of millions of years, how can this possibly have worked out this way?  Continue reading “Why dinosaurs and humans both have a radius and ulna”

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