Figure 2. Head of immature male Calliope showing few adult-type gorget feathers. Throat feathers of female and immature birds appear mostly light with dark gray bases. The pattern of throat feathers vary from (left to right): unpatterned; with a slightly darker area in the center; a prominent dark center (typical of immature males); or with a small iridescent green disk (e.g., Calliope and Anna's).