Pygmy elephants. Monkeys with noses the size of beer cans. And a deer so small you could cradle it like a baby. And right there, sitting on a leaf, is the strangest bug we've ever seen . "Check out the size of it," says virus hunter Kevin Olival as he picks up a ginormous roly-poly. "It's the size of a ping-pong ball!" We're in the middle of Malaysia's Borneo rain forest. Olival has brought us here because this is the type of place where pandemics are born. HIV came from a rain forest. So did Ebola. Yellow fever. And Zika. The next troubling outbreak could come from a rain forest like this. And a big reason why: all the crazy animals that live here. Rain forests are the world's secret laboratory — where evolution experiments with body shapes, sizes and colors. Maybe if a monkey gets a giant schnoz, he'll have a better time finding love? The result is a biological bonanza. "It's a biodiversity hot spot," says Olival, an ecologist and evolutionary biologist with the U.S.-based nonprofit