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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Because being big is not a really good trait for evolution to select. It has clear advantages, but requires a lot of energy to maintain. So in a post apocalyptic scenario, it would be extremly hard to thrive and reproduce while being big.
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