I never learned much about evolution, so please do explain it like I’m 5
In: Biology
They went extinct because they were not fit to live in the changed environment.
By the time the environment “recovered”, other animals had already taken their place. Mammals who were fit to survive the fallout thrived in the absence of the large dinosaurs, and so did smaller flying dinosaurs (also known as “birds”).
In very simple ELI5 terms: Dinosaurs got up from their chair, and mammals sat down on it. Then there was nowhere left for dinosaurs to sit and they were “out”.
Besides, there wouldn’t have been enough time for dinosaurs to evolve “from scratch” anyways. Dinosaurs took about 350 million years to evolve the first time. They have only been extinct for about 66 million years.
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