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12 of the Cutest Sloths You've Ever Seen!Don't call 'em lazy: These creatures at Costa Rica's Aviarios Sloth Sanctuary are working it!

THE SLOTHPITAL

The best part of running the sanctuary is seeing injured or sick sloths returned to health, says Avey-Arroyo. The "Slothpital" treats lots of vehicle and powerline injuries, including Leena's – horrifically, she was hit by a car, then set on fire. Luckily, she made it to the sanctuary, where she fully recovered and has a permanent home.