Bonaparte's Gull Chroicocephalus philadelphia

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Photos from this Account

Breeding adult

Small gull with a thin black bill. Breeding adults have an entirely black head with thin white eye crescents and red legs.

Nonbreeding adult

Small and delicate looking gull with a thin black bill. Nonbreeding adults have a black smudge behind the eye and pink legs.

First winter

First winter birds have a black smudge behind the eye and a black bar across the wings that is visible on resting and flying birds.

Juvenile

Juveniles are a patchwork of brown and gray, but note the dark spot behind the eye.

Nonbreeding adult

In flight, nonbreeding adults have a white tail and black tips on the primaries.

First winter

First winter birds show the characteristic "M" pattern on the back and have pale underwings, only showing black on the tips of the feathers. Note black tail band.

Juvenile

Juveniles have a black "M" pattern with a mottled brown-and-gray body.

First summer

First summer birds start to acquire black feathers on the head. Note dark spot behind the eye.

Habitat

Breeds around lakes and marshes in the boreal forest. Winters along lakes, rivers, marshes, bays, and beaches along the coast.

Recommended Citation

Bonaparte's Gull (Chroicocephalus philadelphia), In Neotropical Birds Online (T. S. Schulenberg, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. retrieved from Neotropical Birds Online: https://neotropical.birds.cornell.edu/Species-Account/nb/species/bongul