In American folklore, the Gumberoo is a
fearsome critter with hide so tough that bullets bounce off of it.
Description
The gumberoo was described by early lumberjacks to be larger than a bear with a tough, shiny, black hide[1] that nothing could pierce. The only way to kill it was said to be
fire, which caused the creatures to explode.[2][3]
References
^Cox, William T. with Latin Classifications by George B. Sudworth. Fearsome Creatures of the Lumberwoods. (Washington, D.C.: Judd & Detweiler Inc., 1910)