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Kangaroo Island kangaroo. Kangaroos give birth to babies the size of a jellybean – and one of the first things to develop is their amazing sense of smell. The teats of the adult female act as GPS units, guiding the babies through smell into the mother’s pouch, where they can spend five months developing into a joey. Kangaroos can actually have three joeys at once – one in the birth canal, one developing and feeding in the pouch, and a third at foot who can still require their mother’s milk. (Photo by Joel Sartore/National Geographic Photo Ark/The Guardian)
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