Animals Have Emotions, As Well

For the most part, the one emotion that is easy to spot in the animal kingdom would be grief. Grieving behaviors are varied, although there’s a common thread to them all. It does not seem to have any evolutionary advantage to it. Grieving animals tend to deviate from the usual behavior. Some cease eating, some would even leave the pack for days on end, others go back to the carcass to protect it from scavengers. Since such a behavior does not seem to come from an instinct for survival, or actually have any purpose to it at all, it can be assumed that animals display grief for the same reason we do: lost love.