Generally, most animal poop is shaped like a sausage or a snake. However, did you know that there is an animal whose poop is shaped like a cube? That animal is the wombat, a herbivorous Australian marsupial with the distinctive feature of producing cubic feces, which is unique in the animal kingdom.
Wombats are known for producing distinctive cuboid poop, and some researchers believe they tactically disperse these feces in order to communicate with each other. 
- “How Do Wombats Make Cubed Poo?” Patricia J. Yang, Miles Chan, Scott Carver, and David L. Hu, paper presented at the 71st Annual Meeting of the APS Division of Fluid Dynamics, Abstract: E19.0000, November 18–20, 2018.
- “Intestines of Non-Uniform Stiffness Mold the Corners of Wombat Feces,” Patricia J. Yang, Alexander B. Lee, Miles Chan, Michael Kowalski, Kelly Qiu, Christopher Waid, Gabriel Cervantes Benjamin Magondu, Morgan Biagioni, Larry Vogelnest, Alynn Martin, Ashley Edwards, Scott Carver, and David L. Hu, Soft Matter, vol. 3, 2021.