Why didn’t the small post apocalypse survivor dinosaurs just refill the niches? Did the asteroid alter the planet in some way fundamentally different than the prior 200M years?
Edit: (collaborative clarification with my 5yo, with paraphrasing): Birds are boring dinosaurs. Why didn’t the big dinosaurs (non bird) come back? Why are there no mammal-sized (non bird) dinosaurs? (e.g., mouse through elephant-sized or even whale size)
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>Why didn’t the small post apocalypse survivor dinosaurs just refill the niches
They did. That’s what modern birds are. Modern birds are the descendants of the dinosaurs that survived the extinction 66 million years ago. If you’re asking why didn’t those surviving dinosaurs evolve into the dinosaurs that had just gone extinct, that’s not how evolution works.
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