While many animals display kiss-like behaviors, and are certainly expressing trust and fondness for one another, they are not exactly kissing. I think it really just boils down to semantics, though. The definition of kissing in the first place necessitates the possession of lips, something many animals that we observe kiss-like behaviors in don’t even have! So how could they be kissing? There is only one animal that kisses in practically the same way that humans do, and that is the Bonobo Ape.
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