Photo: Julia Kuznetsova/Shutterstock
Humans like to think of themselves as a faithful species, but when it comes to true fidelity, many other animals offer better examples of how to keep a relationship together. Although monogamy and lifelong pair bonds are generally rare in the animal kingdom, there are some animals that pull it off.
This story was originally written in February 2010 but has been updated with additional information. Read more.