What animal became important to the plains people during hunting and warfare?

The animal that became incredibly important to the Plains people during hunting and warfare was the horse.

Here's why:

* Hunting: Horses allowed the Plains people to travel much faster and cover greater distances, making them more efficient hunters. They could pursue buffalo herds, which were a vital source of food, clothing, and tools.

* Warfare: Horses gave the Plains people a significant advantage in warfare. They could move quickly and strike with greater force, and their mobility made them difficult to ambush.

While other animals like buffalo were vital for survival, the introduction of the horse completely transformed the Plains people's way of life, making them highly mobile and successful hunters and warriors.