Why does natural selection appear to happen slowly on long timescales and quickly on short ones? A multigenerational study of four lizard species addresses biology’s “paradox of stasis.” James Stroud ...

The extinct Tasmanian tiger, also known as the thylacine, looked eerily similar to modern canids, a group of predatory carnivores that includes wolves, foxes, and domesticated dogs. But thylacines ...

Sometimes, Darwinian natural selection stumbles upon the same solution more than once, in a process known as convergent evolution. Here are our favorite examples of evolution making the same creature, ...