They eat the bark and cambium layer beneath the bark. Beavers cut down trees by chewing through the base. Sometimes their handy work of downed trees causes some human inconveniences in the park areas, such as flooded trails and tree obstacles. Natural predators include wolves, coyotes, and bears. Birds Alaska has 443 species of birds.
Many species migrate to warmer southern climates during the long winter months.
In the fall open fields and city parks become resting sites for large migrating flocks of ducks and geese. For the bird watcher Chugiak-Eagle River area has plenty to see all year round from soaring eagles to the mysterious ravens that are found in both suburban and rural areas. Hundreds of Dall sheep live in the Chugach Park mountains. High meadows and open ridges are sheep's normal habitat. In the spring months sheep move to lower mountains and elevations to find snow free areas to feed.