image: Assamese macaque infants playing in a tree at the Phu Khieo Wildlife Sanctuary in northeastern Thailand. This material relates to a paper that appeared in the August 14, 2015, issue of Science, published by AAAS. The paper, by A. Berghänel at University of Göttingen in Göttingen, Germany, and colleagues was titled, 'Locomotor play drives motor skill acquisition at the expense of growth: A life history trade-off.' view more
Credit: [Credit: Andreas Berghänel, 08/09/2011]