3 million-year-old toddler could climb trees, study says

More than 3 million years ago, our adult human ancestors were walking on two feet and didn't have the option of a fashionable baby sling to carry their kids around in. Instead, Australopithecus afarensis toddlers had a special grasping toe that helped them hold on to their mothers and escape into the trees, reports a study published July 4 in Science Advances.