What features do mastodons have that were unique to its survival?

Woolly mammoths had far too many adaptations to list them all. Here are a few of the adaptations that they had:

1. Like modern elephants, they had a long trunk for grasping food.

2. Their large size would have made them difficult to hunt, even for a skilled predator.

3. Woolly mammoths had a thick layer of fur, as well as a thick layer of fat, to keep them warm in the cold tundra climate.

4. The fact that they had small ears minimized heat loss.