Imagine the asteroid had missed, and dinosaurs survived.
for fighting and display. Yet dinosaurs mostly seem to repeat themselves, evolving giant herbivores and carnivores with small brains.
There’s little about 100 million years of dinosaur history to hint they’d have done anything radically different if the asteroid hadn’t intervened. We’d likely still have those supergiant, long-necked herbivores and huge tyrannosaur-like predators.They may have evolved slightly bigger brains, but there’s little evidence they’d have evolved into geniuses. Neither is it likely that mammals would have displaced them. Dinosaurs monopolised their environments to very end, when the asteroid hit.
Mammals, meanwhile, had different constraints. They never evolved supergiant herbivores and carnivores. But they repeatedly evolved big brains. Massive brains evolved in orcas, sperm whales, baleen whales, elephants, leopard seals and apes.Today, a few dinosaur descendants – birds like crows and parrots – have
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