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RE: "Cry me a river" - from biology to psychology of tears
great post, really well researched and written as soon as I read that we are the only animals to dry from emotion I went to fact check remembering Koko the gorillas morning of the loss of her pet kitten and thought she may have cried but nope.
There appears to be an evolutionary pressure for other animals to conceal their emotions.
This surprised me too because animals can cry just not in response to emotion, I did not know that until a couple of days ago.