Add Yahoo as a preferred source to see more of our stories on Google. Researchers say sloths aren't lazy, they're just "energy efficient." (Photo illustration: Yahoo News; photo: Getty Images) Magill ...

They’re slow, they're sedentary and they like to sleep. Sloths are widely known as the world’s laziest animal but are they getting a bad rap? NBC’s Stephanie Gosk gets up close and personal with ...