One litter of kittens can be produced by more than one father.
57
Squirrels will sometimes adopt orphaned baby squirrels that they’re related to.
12
Sea otters hold hands while sleeping so they don’t drift away from each other.
104
Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
13
When cats are happy, they may squeeze their eyes shut.
10