alaska Moose, Alces alces, in the natural environment swamp. Biebrza marshes National Park. The largest mammal hoofed on swamps. Moose, Alces alces, in the natural environment swamp. Biebrza marshes National Park. The largest mammal hoofed on swamps. Moose, Alces alces, in the natural environment swamp. Biebrza marshes National Park. The largest mammal hoofed on swamps. Moose, Alces alces, in the natural environment swamp. Biebrza marshes National Park. The largest mammal hoofed on swamps.