Jen-Wei Wang, Yu-Sheng Chiang, Jhih Chen, Hao-Hsun Hsu. 2018. Development of a Dung Beetle Robot and Investigation of Its Dung-Rolling Behavior. Inventions, 2018, 3, 22: 1-13.doi:10.3390/inventions3020022 www.mdpi.com/journal/inventions