Since brown bears don't depend on concealment for protection, if intruded upon they may choose to attack as a defense than run. So take precautions on the Chugach park trails. Beavers Alaska's largest rodent,the beaver, lives in dens dug into the banks of rivers or lakes. Eagle River valley has several beaver lodges and dams. Their ponds are deep enough so that they do not freeze solid in winter.
Beavers cache food for the long Alaskan winter by stock piling branches in their pond.
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.