Have you ever heard of the Grand Canyon? It is one of the largest canyons in the world. A canyon is a deep crack in the earth. There are cliffs on each side. Sometimes, a river flows through it. Many animals live in canyons. Grey squirrels make their homes there. Rabbits and mice live threre. So do hawks and owls. Long ago, people used to live in caves above canyons. The Grand Canyon is pretty. It is red and orange and yellow. You can take a train to see it. You can ride a mule down to the bottom of it. You can even raft on the river that goes through the Grand Canyon.