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I can't think right offhand of any examples of convergent evolution. Evolution results in a diverse population, in other words, speciation. Still, the dinos were most likely no less diverse than modern birds. It's quite possible that more than one species of dinosaur actually evolved feathers and gradually became more and more birdlike. Whether the hypothesis involves one particular species of dinosaur having been the ancestor of birds, while all the rest simply died out, I'm not sure.
I can't think right offhand of any examples of convergent evolution. Evolution results in a diverse population, in other words, speciation.
Still, the dinos were most likely no less diverse than modern birds. It's quite possible that more than one species of dinosaur actually evolved feathers and gradually became more and more birdlike. Whether the hypothesis involves one particular species of dinosaur having been the ancestor of birds, while all the rest simply died out, I'm not sure.