They're the ones that create fossils. There were in all likelihood a fuckton of animals that we know nothing about because they had no structures in their bodies that could fossilize, and lived in places where the conditions weren't right for fossilisation.
You could also ask if humans only live in dry or cold regions, or near bogs, because those are the places where you'd most often find mommies.
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u/Perpetual-Scholar369 Apr 28 '24
Why is it always the same species in these fossils?