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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A similar question to above, is why are there no land critters bigger than the elephant today?
It seems to me that evolution has selected smaller animals after the apocalypse. We do have a number of largish mammals, and there are some large crocodiles/alligators, and certainly the large ocean mammals, sharks, and fish but nothing on the scale of a T-Rex or Sauropod.
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