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A fish that walks on land, a frog that makes its own sunscreen, and an insect that can become invisible? Whether to avoid predators, to stalk prey, or to withstand extreme temperatures, Earth's creatures have evolved some outrageous features and tricks to ensure survival. For example, did you know that the geoduck (nope, it's not a duck, it's a clam) can live as long as 160 years? And that the aye-aye, a nocturnal primate, uses echolocation and a long, spindly finger to find and dig up food? Or that in its deep-ocean habitat, the vampire squid uses bioluminescence to startle predators? These are among the many animals that show evolution and adaptation at work.