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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Small post apocalypse dinosaurs did fill niches. They are the birds ~~and reptiles~~ of today. They just didn’t return to being the dominant life form. (Edit: because reptiles had already split evolutionarily from dinosaurs. Reptiles, birds, crocodiles, and the extinct dinosaurs were together in a bigger group called the sauropsids)
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