The June 2017 issue of Discover Magazine has an article on play behavior in non-mammalian animals. Called “The Play’s the Thing,” it features interviews with Professor Gordon Burghardt and alumnus Jonathan Pruit (PhD 2010, Riechert Lab, now on the faculty at UC-Santa Barbara). The article references a paper published in 2012 that was written by Burghardt, Pruitt, and Riechert.
The article is now available online. Tennessee Today also has a story about the article