How do you show someone you care? A kiss is one way. In the animal kingdom, bird parents sharing food, a wood duck pair allopreening, or just about any creature (including humans) resting, swimming, walking or running together expresses an attachment. Valentines Day is a day to celebrate those we care about, and while a valentine can be a parent, child, sibling or schoolmate, Valentine’s Day is an especially significant event for lovers. We celebrate the day with flowers or candy and greeting cards that sport symbols like hearts, doves or the winged figure of Cupid.