Large mammals include Dall sheep, mountain goats, caribou, wolves, and black and grizzly bears. Smaller mammals include lynx, wolverines, beavers, martens, porcupines, foxes, coyotes, marmots, river otters, ground squirrels, pikas, and voles. Marine mammals include steller sea lions, Dall porpoise, orcas, and humpback whales. The NPS has prepared a checklist of park mammals
There are very few reptiles and amphibians anywhere in Alaska due to the cold temperatures.
There is a huge variety of birds in the park. About 240 species have been observed. The NPS has prepared a checklist of park birds
The park is a fascinating study in plants. The entire area is recently released from the ice, so plant communities are still taking over. The coastal areas are covered in rain forest, the easiest to view being the Bartlett Cove area immediately around the lodge and campground. The NPS has prepared a checklist of park plants