A study in  Australia shows that magpies that live in groups show high levels of intelligence. Because the birds live in such complex social groups there is more competition, growing their intelligence. Also female birds who are able to do more cognitive tasks, have more offspring. This is an example of evolution, where you see the birds change reproduction amount based on how they become smarter. This is interesting to me because this could be affecting more than just birds, and this proven test could be trialed on other species.

https://www.sciencedaily.com/releases/2018/02/180207140406.htm
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