Two male koalas slowly climbed trees and snacked on eucalyptus leaves Tuesday at their new home at Brookfield Zoo Chicago, as hundreds excitedly waited in line for the chance to see the marsupials ...

Koalas look like they belong in a children's book, but spend enough time around one, and you'll realize—they're not exactly peace-loving tree-huggers. Beneath the sleepy eyes and teddy bear vibes is a ...