Heermann's Gull Identification

Adult Description

  • Medium-sized gull.
  • Body gray.
  • Back darker.
  • Head white.
  • Bill red.

Immature Description

Juvenal plumage: Uniformly sooty brown all over. Buff edges to feather tips, giving scaly look. Bill two-toned, with pale flesh base and black tip. Eyes dark. Legs black.
First winter (Basic I): Uniformly sooty brown all over. Bill two-toned, with pale flesh base and black tip. Eyes dark. Legs black. Wing feathers and tail black.
Second winter (Basic II): Body sooty gray. Head and nape slate black. Eyes with thin, pale white crescents above and below. Secondaries and tertials dark with white tips. Tail black with narrow white band at tip.
Second summer (Alternate II): Imperfect whitish hood. Body sooty gray. Eyes with thin, pale white crescents above and below. Secondaries and tertials dark with white tips. Tail black with narrow white band at tip.
Relative Size

Relative Sizecrow sizedcrow-sized
Measurements
  • Both Sexes
    • Length: 18.1-20.9 in (46-53 cm)
    • Weight: 13.1-22.7 oz (371-643 g)
    • Wingspan: 40.9-45.3 in (104-115 cm)