Some animals have body parts that give them an edge in their battle for survival. The wondrous octopus, a cephalopod, has individually unique white spots on its head, three hearts in its mantle and arms attached to its head that hold two thirds of the brain's neurons. The smartest of all invertebrates, they are incredible problem solvers. The Mexican axolotl salamander can regrow most of its body parts, unlike any other creature. Scientists are studying the specialized cells empower this unique regeneration ability. Australian royal spoonbills sweep their spoon-shaped bills side to side in fishing. At breeding times both males and females sport long white plumes signalling readiness to mate. The Victoria crowned pigeon sports a lacy crest, used in attracting a monogamous mate. The tall, heavy, flightless, endangered southern cassowary has a keratin horn, called a casque, used in wooing prospective mates and pushing through dense vegetation. Its second toe has evolved into a razor sharp dagger. The legendary nocturnal aye-aye lemur locates food in its Madagascar forest home by tapping its extra long finger and listening for insects, one of nature's few percussive foragers.