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Friends with Benefits

The urge to pair up in penguins is so strong that is there are no females around, the males penguins have been known to pair up themselves.  In captivity, male couples have been known to pair up and raise a family.  If you give them an egg to raise, they will incubate it.

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On the frozen wastes of Antarctica, a mother-to-be Adélie penguin sells her body for stones. In deepest, darkest Africa, chimpanzees trade meat for sex. In Canada, a post-hibernation gathering of garter snakes becomes a frenzied orgy. A redback spider eats her partner alive while they're still mating. Are these animals behaving badly? Or is the drive to reproduce so fundamental in the animal kingdom, that "anything goes"? Meet the world's weirdest friends with benefits.