Ross's Gull Identification

Adult Description

  • Small gull.
  • Mostly white.
  • Pale gray back.
  • Whitish or light pink underside.
  • Small, dark bill.
  • Slightly pointed tail.
  • Thin, dark ring around neck in breeding season.

Immature Description

Juvenal Plumage: Dusky brown overall. Belly white. Light edges to dark back feathers give scaly appearance. Dark cap. White throat and eyeline. Tail white, with black tips to elongated middle feathers. Black bar across wings, makes "M" across back visible in flight. Wingtips black. Dark spot behind eyes. Bill black. Legs flesh-brown.
First Winter (Basic I) Plumage: Back pale gray. Underparts white. Head white. Black spot behind eyes. Dark smudgy area around eyes. Tail white, with black tips to elongated middle feathers. Black bar across wings, makes "M" across back visible in flight. Wingtips black. Bill black. Legs flesh-brown.
First Summer (Alternate I) Plumage: Ring around neck; slightly smudgy at back. White underparts, washed rosy. Head white. Tail white. Black bar across wings makes "M" across back visible in flight. Wingtips black. Legs bright red. Looks like an adult with immature wings.
Relative Size

Relative Sizebetween crow and goosebetween crow and goose
Measurements
  • Both Sexes
    • Length: 11.4-12.2 in (29-31 cm)
    • Weight: 4.9-8.8 oz (140-250 g)
    • Wingspan: 35.4-39.4 in (90-100 cm)