The widespread propensity among mammalian species to care for the deceased is a spillover effect of the oxytocin-based nurturance instinct. https://link.springer.com/article/10.1007/s10329-019-00722-3 …pic.twitter.com/WZF5MyBa7R
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I would say, having a concept of future events (or future missing of events) is slightly different from recognising that a member of the own group is dead. Even without the capability of the full human spectrum of understanding, there is no reason to negate suffering from loss.
One of the best indications of animals not having a concept of mortality is that they may greet each other, but they never say goodbye:https://twitter.com/DegenRolf/status/946428485890990080 …
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