There are a few theories Test001(News)
There are a few theories about how they developed flight–ground-up, arboreal leaping, and arboreal parachuting–but none of them really stick out as particularly better than the others. One animal often cited as a pterosaur ancestor is Scleromochlus, a tiny kangaroo-like archosaur that lived in the early Late Triassic (237-ish million years ago) and probably hopped adorably through the desert. Below is an image showing the speculative transitional forms between Scleromochlus and Preondactylus, an early pterosaur that lived in the middle Late Triassic (228-ish million years ago):
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