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A Bird’s-Eye View of Nature’s Hidden Order
Scientists are exploring a mysterious pattern, found in birds’ eyes, boxes of marbles and other surprising places, that is neither regular nor random.
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.