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Modelers find evidence that a combination of competition, predation and evolution will push ecosystems toward species diversity anywhere in the universe.
The rapid, unorthodox emergence of a new finch in the Galápagos hints that speciation isn’t rare. New hybrid species may quietly appear and disappear without anyone noticing.
Mitonuclear conflict — a struggle between the genes in a cell’s nucleus and its mitochondria — might sometimes split species in two.
Despite swapping DNA through interbreeding, butterflies and other animals can maintain distinct species.
A large new study of ovenbird lineages questions the extent to which competing species push each other to evolve.