Hagerman typically winters 30,000-40,000 ducks. Amazing numbers of Bald Eagle and waterfowl can be present during winter especially when other water bodies are frozen. The winter gull flock that roosts on the islands in Riley Pond often contains Herring Gull. Thayer’s, Glaucous, Glaucous-winged Gulls, and other varieties also occur occasionally. Large populations of breeding waterfowl (Mallard, Cinnamon and Green-winged Teal, Gadwall, Redhead, Ruddy Duck, Canada Goose), Yellow-headed Blackbird, and Northern Harrier occur within the WMA. During spring and summer, waterbirds (American Coot, Pied-billed Grebe, Western Grebe, American Bittern, Virginia Rail, Sora, California Gull, Double-crested Cormorant, Forster’s Tern), shorebirds (Black-necked Stilt, American Avocet, Long-billed Curlew) are common. During migration, Common Loon, Tundra Swan, and other shorebirds can be seen.