On February 20, we celebrate National Love Your Pet Day, a day to embrace one special trait that makes us human: our love of our pets! There are many things that differentiate humans from the rest of the animal kingdom, but one of the more unusual behaviors is our longstanding tendency to keep other animals as pets. While there have been a handful of other animals that have been observed keeping pets — Koko the gorilla and her cats are one well-known example — we’re the only species where it’s a common occurrence. Gallup reports that sixty percent of Americans are current pet owners. It only makes sense to commemorate something that’s so important to so many people, so on February 20, we celebrate our pets with Love Your Pet Day!