Frogs and other amphibians lay eggs, but mammals give birth to live young, right? Not always. A newly described species of frog gives birth to live tadpoles, and is the only known frog to do so, ...

MUCH of my time as a biologist has been spent looking through a microscope at the beginnings of individual lives, partly in an effort to understand a little of how animals develop from eggs, partly ...

A few years back, a message from a frog-loving friend dropped unexpectedly into my mailbox. “Toughie,” he wrote, “is dead.” Toughie the frog had fans the world over, and I was one of them. Impossibly ...