Species constantly engage in strong interactions with other species - parasites, predators, prey, and mutualists. As a result, their traits may coevolve and diversify in geographic mosaics.

Scientists discovered two Jurassic bird fossils in China, pushing back bird diversification by 20 million years. One, ...

"Every piece of this process has been revealing itself like an onion. It peels off, and another thing arrives," said the lead ...

Wang: A fossil’s age is always later than the species’ actual origin. To estimate evolutionary timelines, scientists construct phylogenetic trees — a “Tree of Life” that maps species’ relationships ...

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