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Why were dinosaurs so massive in size?

Did small mammals and small reptiles grow in size to different degrees after the dinosaurs died off? Why?

  • Did small mammals grow in size after the dinosaurs died off? Did small reptiles grow in size as well? If the answers to these questions are different why is that the case?

  • Answer:

    Small reptiles were not well adapted to be large land animals.  Dinosaurs probably had specific adaptations that helped.   Birds, which now seem to be closely related, did develop some big land animals, notably ostriches which are still doing fine.  But mostly they were not as good at it as mammals.

Gwydion Madawc Williams at Quora Visit the source

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After dinosaurs became extinct, extremely large mammal species did evolve. These include everything from the woolly mammoth to the blue whale, which is the largest animal to have ever lived and which still lives today. Since mammals were better equipped to occupy the niches once occupied by large reptiles (dinosaurs), larger reptiles never did evolve after the dinosaur extinction event. That said, there are still some large reptiles on the planet including the saltwater crocodile which can measure 15 feet long and weigh up to one ton.

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