Although most rodents have a reputation for promiscuity, prairie voles break the trend, generally forming monogamous pair bonds that occasionally last a lifetime. In fact, the prairie vole is typically cited as an animal model for monogamy in humans. They huddle and groom each other, share nesting and pup-raising responsibilities, and generally show a high level of supportive behavior.
If a male vole shows even the slightest hint that he's not going to stick around once babies are born, the female will grab him by the scruff of the neck, reports Smithsonian. It's rarely necessary because, after all, the word "vole" is an anagram of the word "love."