That’s part of the process. As we find out more fossils and new evidence, we understand a bit better how these animals worked and looked like.
This is not the link I was looking for but it also shows some revisions we did throughout the years:
https://nixillustration.com/category/theme-months/retro-vs-modern/
Same, despite being in early access it’s already a lot of fun. Feels like the game that I wanted gamefreak to make but never did.