Researchers conducted an experiment with human-raised ravens that shows these birds remember who to trust after one interaction.
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In the experiment, a raven exchanges bread with a “fair” partner who reciprocates with cheese, and an “unfair” partner who takes takes the bread and keeps the cheese for herself. When presented with three individuals offering cheese, the raven chose the person most likely to offer a fair trade. The researchers concluded that ravens can recognize and remember a fair trade from a single interaction and show a preference for those who were fair to them.
Read “Ravens Hold Grudges Against Cheaters.”
http://news.nationalgeographic.com/2017/06/ravens-memory-unfair-trade/
Ravens Like You Better When You’re Being Fair | National Geographic
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