[4] In an effort to determine species presence, distribution, habitat use, and migratory patterns, extensive land bird studies were conducted from 1995 through 1998 at various locations around Becharof Lake.

[4] Biologists continued the monitoring work in the park 2001 through 2003 using the same methods, paying notable attention to seabird activity, along with caribou and Alaskan moose populations.

[3] Wildlife is abundant in the park and the high levels of salmon are enough to feed the largest concentrations of brown bears in Alaska.

[4] The river provides habitat for thousands of ducks, geese and swans that will later populate breeding lakes and ponds on the Alaska Peninsula and the area is closely monitored by biologists and ornithologists.

[4] The area contains notable populations of common merganser, common goldeneye, American green-winged teal, Canada goose, greater scaup, tundra swan, greater white-fronted goose, mallard, northern pintail, American and Eurasian wigeon, northern shoveler, red-breasted merganser, black scoter, and long-tailed duck.