Photo 1. Tundra Swan on left, Trumpeter Swan on right
Photo 2. Trumpeter Swan and American wigeon. Note head and bill shape of swan.
Photo 3. A pair of Trumpeter swans. Female on left, male on right. This is shows how the sexes can sometimes substantially vary in size. A male and a small female paired together.
Photo 4. A family of Trumpeter Swans. Note the darker plumage, especially on the head and neck, of the juveniles and the color of their legs/feet. The legs/feet are heavily mottled at this age. The head shape is another key to ID.
Photo 5. Note the wide variation in head shape and the yellow spot on the lores. This is common in Tundra swans.
Photo 6. Tundra Swans- juvenile on left, adult on right. Note the head shape of both swans and the color of the juvenile. The juvenile is lighter gray and has black legs/feet. There is a yellow spot on the lore of the adult. Both have the eye distinct from the bill.
Photo 7. Red star is Tundra swan. Others are Trumpeters. The red arrow points to a neck band on a Trumpeter Swan. If you had a scope, it would read M21, reading from body to head on the collar.