Leo Grasset (scripter) has advanced degrees in evolutionary biology and organismal and ecosystems biology. In 2014, he began to make humorous and educational YouTube videos about biology. An English translation of his first book was published as How the Zebra Got Its Stripes: Darwinian Stories Told Through Evolutionary Biology. Colas Grasset (artist) has collaborated with his brother Leo on several episodes of the YouTube program DirtyBiology. He blogs about his work at http://hou-bim.blogspot.com.