As romantic as it may seem, the reason some species mate through life has more to do with the need than love. Having to go through the hassle of finding a partner every year makes the animals vulnerable not only to predators but also to severe conditions experienced by some.
For example, most people believe that penguins mate for life and this is real for most species, although the emperor penguin is serially monogamous, which means they will join with a single mate each season.
Although it is the monogamous animal example for most people, there are some other species that have spent their entire lives with the companion of their choice. In this selection are highlighted the 10 Animals That Have A Lifelong Companion.