Only a select few animals are able to glide long distances through air, but they include an amazing variety-- even a few species of frogs and snakes. Catching Air takes us around the planet to meet these animals and explore why this gravity-defying talent has evolved in mammals, amphibians, and reptiles. What advantages do gliders gain? Why do so many gliders live in the rainforests of Southeast Asia? Does flying evolve from gliding, and if so, why haven't gliders taken that next step?