species 27,770 observations
Bonaparte's Gull
Chroicocephalus philadelphia
Field notes
Bonaparte's gull (Chroicocephalus philadelphia) is a gull found mainly in northern North America. At 28 to 38 cm (11 to 15 in) in length, it is one of the smallest species of gull. Its plumage is mainly white with grey upperparts. During breeding season, Bonaparte's gull gains a slaty-black hood. The sexes are similar in appearance.
Read more on WikipediaRange
Greener is more native, amber more introduced; paler is less certain. How this was decided