The U.S. Greeting Card Association estimates that approximately one billion valentines are sent each year worldwide

The association also estimates women purchase approximately 85 percent of all valentines

Humans aren't the only ones who honor this wonderful day. Animals do too.

Valentines Day honors not one, but three Saints of the Catholic church. Yes, Threeeeeeeee

The "heart" shape is formed by the wings of a dove, which was associated with Aphrodite, Greek goddess of love