American herring gull
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| phylum | Chordata | The American herring gull or Smithsonian gull (Larus smithsonianus or Larus argentatus smithsonianus) is a large gull that breeds in North America, where it is treated by the American Ornithologists' Union as a subspecies of herring gull (L. argentatus). Adults are white with gray back and wings, black wingtips with white spots, and pink legs. Immature birds are gray-brown and are darker and more uniform than European herring gulls, with a darker tail.
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| clade | Diapsida | |
| Class | Aves | |
| order | Charadriiformes | |
| family | Laridae | |
| genus | Larus | |
| species | L. smithsonianus |