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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The Moa, the terror birds and the Elephant bird would like a word.
The reason birds were limited is because by the time they grew to large sizes again, mammals had already filled most of the “big animal” niche.
That’s also why the biggest birds were in isolated landmasses with no placental mammals (South America, New Zealand, and random small islands)
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