Wild spotted hyena opening a puzzle box

This is a video of a complete trial of one wild spotted hyena, named Einstein, opening a puzzle box that was baited with meat. The research shown in this video is described in detail in Benson-Amram S. and K.E. Holekamp, 2012. Innovative problem solving by wild spotted hyenas. Proceedings of the Royal Society B: Biological Sciences, 279(1744), 4087-4095.