"Of the roughly 5,000 species of mammals, only 3 to 5 percent are known to form lifelong pair bonds. This select group includes beavers, otters, wolves, some bats and foxes and a few hoofed animals." Scientists are trying to puzzle out why some animals stick by their mates and others don't. Be sure to check out the slide show: monogamy certainly doesn't have to be boring!

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