1. Yellow-billed Loon Gavia adamsii, juvenile, Lake Havasu, Arizona, USA, February 24, 2002. This bird frequented Lake Havasu on the California-Arizona border and was seen in both states.  Note the extensive pale scaling of the upperparts, the extensive white areas on the side of the neck and the isolated gray-brown spot on the ear coverts.

2. Yellow-billed Loon G. adamsii, juvenile, Lake Havasu, Arizona, USA, February 24, 2002. Note the distinctive bill shape and color, the thick neck and the bulging forecrown.  The culmen appears slightly convex in this side view but this is not atypical of juvenile Yellow-billed Loons.

3. Yellow-billed Loon G. adamsii, juvenile, Lake Havasu, Arizona, USA, February 24, 2002.  The culmen appears dusky over the basal third but the remainder, including the tip, is a pale yellowish horn color.

4. Yellow-billed Loon G. adamsii, juvenile, Lake Havasu, Arizona, USA, February 24, 2002.  This bird typically swam with the head and bill slightly up-tilted, recalling Red-throated Loon G. stellata.

5. Yellow-billed Loon G. adamsii, juvenile, Lake Havasu, Arizona, USA, February 24, 2002.  Note the extent and pattern of the limited dark feathering on the hindneck.

© Stephen J. Davies

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