How do you learn about the social behaviour of animals that have been extinct for millions of years? Pa–’t – tell us about how the dinosaurs lived. Subscribe for regular science videos: http://bit.ly/RiSubscRibe Piecing together the behaviour of long extinct groups is naturally very difficult, but can be done with care. New fossil from the Gobi deserts of Mongolia are helping us work out how these animals lived and died together. David Hone is a palaeontologist and writer. His research focuses on the behaviour and ecology of the dinosaurs and their flying relatives, the pterosaurs. He writes about palaeontology and science outreach online through his own blog and on the Guardian. http://www.davehone.co.uk/ 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