By Lisa Kadane Special to the Star Sloths have a reputation as sedentary creatures with superb camouflage. But the furry mammal climbing a tree outside our rainforest ecolodge on Isla Colón refused to blend into the scenery. She slowly but surely hooked her two curved toes over the limber branches as she crept along, stopping to hang from her hind legs and give us what appeared to be a shy smile...