National Geographic : 1952 Feb
© National Geographic Society 210 Kodachromes by Paul A. Zahl + Nature's Nonskid Tread-the Suction-cup Feet of a Starfish + Hundreds of vacuum-type podia, or feet, cling to rocks so tenaciously that it takes a powerful pull to dislodge the owner. Round spots along the short, broad arms of Oreaster reticulatus (close-up at left) are the suction-cup ends of the tube feet. Not all starfish are so equipped. + A Cousin, the Brittle Star, Is Sometimes Called the Serpent Star Some species of the brittle star detach an arm if seized; the part comes off in one's hand. Then the creature grows a replacement! This kind lacks that useful gift for foiling its enemies.