When Elephants Weep: The Emotional Lives of Animals | 
In the end, it hardly matters whether stags, beavers, seals, or elephants weep. Tears are not grief, but tokens of grief. The evidence of grief from other animals is strong... Sadness, nostalgia, and disappointment are feelings we know from direct experience; animals we know intimately hint at their parallel feelings in this dark world. ~When Elephants Weep: The Emotional Lives of Animals/Jeffrey Moussaieff Masson
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