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How Dinosaurs Shrank and Became Birds
Modern birds emerged in a snap of evolutionary time through a series of simple genetic changes.
As Animals Mingle, a Baffling Genetic Barrier
Despite swapping DNA through interbreeding, butterflies and other animals can maintain distinct species.
Does Competition Drive Diversity of Species?
A large new study of ovenbird lineages questions the extent to which competing species push each other to evolve.