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Why Humans Weep with Emotional Tears and Animals Do Not
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Almost all mammals produce tears. Dogs, cats, horses, elephants: they all need that saline fluid to lubricate the cornea, remove particles and protect the eye. However, when a dog suffers or an elephant loses a member of his group, none shed visible tears that slip through his face in response to that emotion. Humans, yes. That seemingly small difference — using tears as an emotional signal, not just as a physiological mechanism — is the object …
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