Crows are known as some of the best problem solvers of the animal kingdom. In this clip from the 2017 CHRISTMAS LECTURES, Sophie Scott sets Brann the raven a tough puzzle. Subscribe for regular science videos: http://bit.ly/RiSubscRibe Watch the full lecture: https://youtu.be/ZP05sX5aevk The Ri is on Twitter: http://twitter.com/ri_science and Facebook: http://www.facebook.com/royalinstitution and Tumblr: http://ri-science.tumblr.com/ Our editorial policy: http://www.rigb.org/home/editorial-policy Subscribe for the latest science videos: http://bit.ly/RiNewsletter