Other primates are clever and emotionally present like humans. So how do are we different? From There is a moral argument for keeping great apes in zoos | Aeon Ideas:
We did a study with pairs of orangutans in which we tested their ability to communicate and cooperate to get rewards. We hid a banana pellet so that one orangutan could see the food but couldn’t reach it. The other orangutan could release a sliding door and push the pellet through to her partner, but wasn’t able to take it for herself. They did okay (but not great) when playing with me, and they mostly ignored each other when playing together. We then performed a similar set of studies with human two-year-olds. Compared with the apes, the two-year-olds were very good at getting the reward (stickers) when they played with an adult.
Taken together, these studies tell us something about human evolution. Unlike apes, humans are good at pooling their talents to achieve what they can’t do alone. It’s not that the apes don’t care about getting the food – they got frustrated with one another when things were going wrong, and one orangutan in particular would turn his back and sulk. However, unlike humans, they don’t seem to be able to harness this frustration to push themselves to do better.
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