This Section is rich in bird life and marine mammals, but has few large land mammals. The whiskered auklet is an uncommon breeder but occurs only in this Section in Alaska. Red-legged kittiwakes are also unique to this Section, nesting mainly on Buldir and Bogoslof Islands. The entire population of the endangered Aleutian Canada goose nests here. Nearly all of the world's population of Emperor geese winter in the Aleutians.
Winter wrens and rosy finches are common breeders along rocky beaches.
The introduction of foxes, rats, cats, and dogs resulted in severe reductions of ground-nesting birds. Northern fur seal rookeries are used for breeding and pupping. Numerous Steller sea lion rookeries and hauling grounds occur along the coast. Sea otters also are common along the coast. Sockeye and pink salmon are the most numerous fish species in this Section.