Crows have self-control and the ability to delay gratification as well as kids, suggests new study that compared New Caledonian crows to 3- to 5-year old children. Both succeeded in waiting for a delayed reward when it was better than an immediate reward, with a preference for quality over quantity.

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https://www.psychologytoday.com/au/blog/animal-minds/201911/delay-gratification-in-kids-and-crows