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Platypus. The thick brown fur of the platypus traps an insulating layer of air next to their skin, and the males have a venomous spur on the inside of their hind legs. The bill resembles that of a duck, but is covered with soft, leathery skin containing sensitive nerves that can detect faint electrical fields generated by small aquatic animals that they prey on – unique among mammals. The webbed front paws are used like paddles when they swim, which they do with their eyes and ears closed, using their sensitive bill to sweep the water for prey. Platypuses can stay underwater for several minutes. (Photo by Joel Sartore/National Geographic Photo Ark/The Guardian)
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