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(CNN) - Geckos would definitely medal in a contest for nature's best feet. The lizard's sticky toes, covered in tiny hairs, mean it can climb across ceilings in a fantastic feat of evolution. But scientists say the lizards' tails are just as extraordinary, with geckos performing a remarkable, if ungainly, maneuver that allows them to land securely and at ballistic speeds on vertical surfaces like tree trunks.