The dinosaurs — the so-called tyrants of the Mesozoic era — weren't exactly thriving during their last few million years on Earth, a new study finds. The new analysis of the dinosaur family tree reveals that dinosaurs were disappearing even before the asteroid hit about 65.5 million years ago. Roughly 24 million years before that impact, dinosaur extinction rates passed speciation rates, meaning that the animals were losing the ability to replace extinct species with new ones, the researchers said.
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