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species

Despite swapping DNA through interbreeding, butterflies and other animals can maintain distinct species.
genetics

As Animals Mingle, a Baffling Genetic Barrier

Despite swapping DNA through interbreeding, butterflies and other animals can maintain distinct species.

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A large new study of ovenbird lineages questions the extent to which competing species push each other to evolve.
evolution

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.