|It might be a treasured value in many human cultures, but monogamy is rare in the animal kingdom at large.|
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.
And even the creatures that do pair and mate for life occasionally have flings on the side. Some, like the wolf, waste little time finding a new mate if their old one dies or can no longer sexually perform.