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Here's what you need to know about "kisses" in the animal kingdom

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74% Informative

Humans have been kissing since at least 2500 B.C. According to ancient cuneiform tablets found in Iraq , humans have been smooching since 2500 BC .

Primates are the only animals who can "kiss" using puckered lips the way humans do; other species don't have the necessary anatomy.

The full spectrum of human kissing sets us apart from the rest of the animal kingdom.

Food sharing is also a big motivator for mouth-to-mouth contact in bonobos.

Other animals might share behaviors that resemble kissing in form or function, but the full spectrum is still unknown.