Seeing how quickly and aggressively this mama bear moves to protect her cub from a male black bear is amazing to watch. You don’t mess with a mama bear with cubs and this video filed near Frenchtown, Montana shows why people should adhere to that advice. The speed she has to cover the timber-laden ground and then climb the tree is truly remarkable and explains why you can’t outrun a bear. To see another remarkable bear video watch this Thrilling Bear Encounter.