The only mammals who can both flap their wings and fly, bats play a key role in pollinating our crops and controlling insect populations in our neighborhoods.

They look like a deer crossed with a giant jack rabbit; with long, muscular tails and belly pouches, kangaroos are the world’s largest marsupial.

Turtles have been roaming the Earth for millions of years—but now dozens of these “slow and steady” species are racing toward extinction.