The Aniakchak region is prime habitat for land mammals, waterfowl, marine mammals, fish and shell-fish, and extensive wild runs of five salmon species of Pacific Salmon. Aniakchak includes nursery areas for sockeye salmon runs that are part of the Bristol Bay and Kodiak/Chignik sockeye fisheries. Brown bear, caribou, moose, wolf, wolverine, waterfowl, sea otter, harbor seal, sea lion, and numerous smaller species inhabit the area. Most of the land species range freely throughout the area. Brown bear, caribou, fox, ground squirrel, and eagle are known to inhabit or visit the caldera.