The Aniakchak region is prime habitat for land mammals, waterfowl, marine mammals, fish and shellfish, 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.
Did You Know?
The outlet of the Aniakchak River, referred to as "The Gates," was formed when water within the caldera breached the rim and carved through the wall. Terrace deposits above the current water level of Surprise Lake indicate that the lake once filled 50 percent more of the caldera.