Aye-ayes (Daubentonia madagascariensis) are native to Madagascar. No one knows precisely how many exist in the wild. The International Union for Conservation of Nature (IUCN) classifies the animals as endangered and estimates that more than half of their wild population has disappeared in the past three decades. As adults, aye-ayes are about the size of possums. They use their spindly fingers to tap on the bark of trees, aiming to spook wood-boring insects inside the tree so that they'll move. When the aye-ayes hear the telltale scuttle of a potential meal, the predators chew holes into the bark and fish...