Cygnus buccinator Richardson 1831

Trumpeter swans in the Masdison River, Yellowstone National Park, WY in the winter.

Trumpeter swans in the Masdison River, Yellowstone National Park, WY in the winter.

Trumpeter swans in the Masdison River, Yellowstone National Park, WY in the winter.

Trumpeter swans in the Masdison River, Yellowstone National Park, WY in the winter.

Trumpeter swans in the Masdison River, Yellowstone National Park, WY in the winter.

Trumpeter swans in the Masdison River, Yellowstone National Park, WY in the winter.

Trumpeter swans in the Masdison River, Yellowstone National Park, WY in the winter.

Category hierarchy: Environmental Topics | DiseasesDescription: Wildlife disease specialist Ronald Windingstad examines a trumpeter swan during an outbreak of histomoniasis.Capture device: Nikon SUPER COOLSCAN 5000 ED

another portrait of this magnificent swan.

Denali State Park