this post was submitted on 30 Jul 2025
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Groups never evolve into something. Species do.
Theropods are a group comprising a lot of species.
There was one species of theropod that evolved a few characterics we associate with birds. They evolved into a few species and some of them evolved into yet more species. They're at the origin of the whole bird group.
See it like a tree with branches branching out with many branchss just getting cut short. One of that branching branch is the bird group, and it's on the branching branch of theropod.
And yes, the branching branchs that are Sauropods and Ornithischia were all completely cut at the Cretaceous-Paleogene extinction 65 million years ago.
Thank you, appreciate the answer.
Yeah. It was admittedly a bit heartbreaking to discover that it appears that there are no extant descendents of any sauropod or ornithischia species. :(