Andean Gull
Chroicocephalus serranus
The Andean gull is 42 to 48 cm (17 to 19 in) long and weighs about 480 g (17 oz); it is one of the larger members of its genus. The sexes are alike. Adults in breeding plumage have a glossy black hood with a white crescent behind the eye and a mostly white body with a gray back and sometimes a pink flush on the underparts. Their tail is white. The upper side of their wing is mostly gray with an alternating white-black-white-black pattern on the primaries. The underside of their wing is pale gray with a blackish outer half but for large white "mirrors" on the three outermost primaries. Voice: The Andean gull's vocalizations include "agitated, sometimes tremulous "yeeer" calls" and "a hoarse "raggh-aggh-keeaagh" and other low raspy notes."
ID text from Wikipedia, CC BY-SA 4.0
Hartlaub's Gull
Chroicocephalus hartlaubii
Hartlaub's gull is 37–39 cm in length, with a wingspan of 89–92 cm and a weight of 235–340 g. It is a mainly white gull with a grey back and upperwings, black wingtips with conspicuous white "mirrors", and a dark red bill and legs. When breeding it has a very faint lavender grey hood, but otherwise has a plain white head. The sexes are similar. This species differs from the slightly larger grey-headed gull in its thinner, darker bill, deeper red legs, paler, plainer head, and dark eyes. It takes two years to reach maturity. Juvenile birds have a brown band across the wings.
ID text from Wikipedia, CC BY-SA 4.0
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Andean Gull and Hartlaub's Gull.