Dinosaur: Tail as old as time — researchers trace ankylosaur’s tail evolution

31 August 2015

How did the ankylosaur get its tail club? According to research that traces the evolution of the ankylosaur’s distinctive tail, the handle arrived first on the scene, and the knot at the end of the tail followed.
http://www.sciencedaily.com/releases/2015/08/150831101513.htm