LONDON – MAY 24: A Two-Toed Sloth sits in a tree at London Zoo’s new exhibit ‘The Clore Rainforest Lookout’ opens on May 24, 2007 in London. The new ?2.1 million development features a central biome housing living rainforest trees that are home to groups of tiny monkeys, sloths and birds. (Photo by Peter Macdiarmid/Getty Images)