The key to the sloth's 'slothfulness' has been discovered - they've evolved to use gravity to their advantage.
Source: http://www.cosmosmagazine.com/news/4568/the-decoding-slowness-how-sloths-perfectioned-energy-saving
Amber Heard Amber Valletta America Ferrera Amerie Amy Cobb Amy Smart Ana Beatriz Barros
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