Wouldn’t species always be evolving? Example: Why do we find a couple of dozen T-Rex skeletons and not all the evolving stages that lead to the T. Rex over millions of years? And are those specimens classified as different species?
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Every fossil is a fossil of a transitional animal, between the organism from which the fossil evolved and the fossil into which it was evolving. It’s just that so very few animals actually go on to become fossils after they die (everything needs to go just right for it to happen), there are a great many additional transitional species that aren’t memorialized in the fossil record.
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