Tag: all of Chroicocephalus


Grey-hooded Gull (Chroicocephalus cirrocephalus) Science Article 1 abstract The Grey-hooded Gull (Larms cirrocephalus) is known to breed at only one locality west of the Andes, a small coastal pond named Laguna Chica in the Departamento de lea, Peru (Tovar and Ashmole, Condor 72:119, 1970). We report here a second and larger colony, 56 km north […]

Hatching date influences age at first reproductionin the black-headed gull

Black-headed Gull (Larus ridibundus) Science Article 1 abstract In long-lived colonial birds, age at recruitment is an important life-history character. Variation in this parameter may reflect differences in several factors, including competitive ability and breeding strategies. Further, these differences may be due to timing of hatching (for instance through differences in competitive ability). We investigated […]

An experimental study on the causes of sex-biased mortality in the black-headed gull – the possible role of testosterone

Black-headed Gull (Larus ridibundus) Science Article 2 abstract During early development male offspring in avian species often suffer from enhanced mortality compared to female offspring. This has been attributed to different nutritional requirements, as sex-biased mortality has been reported particularly in sexually size-dimorphic species. However, other traits of the male phenotype, such as the embryonic […]

Bonapartes Gull (Chroicocephalus philadelphia)

[order] CHARADRIIFORMES | [family] Laridae | [latin] Chroicocephalus philadelphia | [UK] Bonapartes Gull | [FR] Mouette de Bonaparte | [DE] Bonapartemowe | [ES] Gaviota de Bonaparte | [NL] Kleine Kokmeeuw Subspecies Monotypic species Physical charateristics This gull has narrow wings, a slender, black, pin-like bill, and pink legs. It has a light slate-gray back, with […]

Slender-billed Gull (Larus genei)

[order] CHARADRIIFORMES | [family] Laridae | [latin] Larus genei | [UK] Slender-billed Gull | [FR] Goeland railleur | [DE] Dunnschnabel-Mowe | [ES] Gaviota picofina | [NL] Dunbekmeeuw Subspecies Monotypic species Physical charateristics Distinctive shape, with long sloping forehead, long slightly drooping bill, and long legs. Head, neck, rump and tail white. Back and upperwings grey. […]

Black-headed Gull (Larus ridibundus)

[order] CHARADRIIFORMES | [family] Laridae | [latin] Larus ridibundus | [UK] Black-headed Gull | [FR] Mouette rieuse | [DE] Lachmowe | [ES] Gaviota Reidora | [NL] Kokmeeuw Subspecies Monotypic species Physical charateristics Frontal hood dark chocolate brown to dusky blackish, with blackish border. White eye crescents, neck white, underparts white. Back, upperwing coverts, secondaries and […]