Bison hunting (hunting of the American bison, also commonly known as the American buffalo)
The species' dramatic decline was the result of ... [various activities, and also] a deliberate policy by settler governments to destroy the food source of the Indigenous peoples during times of conflict.
Hunters began arriving in masses, and trains would often slow down on their routes to allow for raised hunting. Men would either climb aboard the roofs of trains or fire shots at herds from outside their windows.