Dallsheep live in North America.
Moving Up in the World
Some migrations move up and down. For example, Dall sheep move up and down mountains. They move as the seasons change.
In spring and summer, they stay high in the mountains. There is food there. They eat grass. Before winter comes, they move down the mountain. They need more food. There is food further down. How do they know the way? Scientists think the oldest sheep teaches the younger ones.