silver-seagulls is almost world-wide widespread and surely the most known representatives of the seagulls of north and Baltic sea. This zoologist quite is not united for itself over the relationship-relationships of other "big-seagulls" to the silver-seagulls. Certainly is anyway, that numerous seagull-populations of Europe, Asia and North America are among each other reproductive-capable and fertile descendants produce, if also most subtypes cross no more under natural conditions or overlap (race-circle) at all in its spread-area. Very likely these forms of the silver-seagull-group developed in the course of the last ice age and only isolate itself of each other on and on, so that the description of some forms is meaningful as individual types here surely.
Near relatives seagull-types The polar-seagull (Larus glaucoides) equally-big with 56-66 cm of total-length and approximately 1-1,2 kg of weight Z. B. looks like a very light silver-seagull. its back-plumage including the entire wing-upper side is uniformly light-gray; by the way however, it resembles the Central European silver-seagull-forms with exception of the iris and eye-song-coloring. Polar-seagulls brood in North America's (Baffinland, Nordwestlabrador) north and on Greenland. In the winter, they appear on Iceland and the British islands. Some Systematiker look at polar-seagulls as subtype of the silver-seagull.
Also this likewise in the arctic North America and in northwest-Greenland of brooding Thayermöwe (L). thayeri, as subtype of the silver-seagull is presented many times. The same is applicable to the 56 cm tall Mormon, Native Americans or Californian seagull L. californicus, from the western North America (to the south of until low-California).
Brood-area of the silver-seagull The brood-area of the silver-seagull stretches Madeira over the coasts of the northern Africa, the Canaries, for itself, that Azore as well as over whole Europe (including Iceland), Asia (southwards until Armenia, Turkestan, Manchuria and Japan) and North America (southwards until low-California).
Brood-biology Originally, silver-seagulls brooded only on coast-rocks very likely, on what much in the behavior the reproductive-makes ready birds and its boys has closed. As very adaptable animals, silver-seagulls conquered however also sand-dunes, gravel-benches and salt-meadows as brood-biotope. The nests quite extensive for seagulls stand usually colony-wisely together and are stacked by both brood-partners from seaweed and grass. According to spread, the brood-period begins in April or Mays. The nest consists of 2-3 eggs (7 x 4,9 cm) mostly and becomes predominant from the female (from the 1). Egg at, approximately for 26 days erbrütet (Legeabstand 2-3 days).
The nestlings (place-stools) carry a dense, blackish and dun patterned Dunenkleid and are looked after by both alto-birds. The red stain at the top of the parental sub-beak is a strong trigger for the squabs in order to peck after feed there. On pecking of the nestlings, the alto-bird chokes together-collected invertebrates and other food on the ground. Silver-seagulls become finally fully-fledged in the age of 8-9 weeks.
Young silver-seagulls have up to the 4. Year of life very much brown in the plumage. The first youth-dress is the darkest while more light feathers later appear with every molt. Boy herring and silver-seagulls is not to be distinguished practically in the field, while itself young storm-seagulls (L). canus, through its lighter plumage on the underside as well as the very light tail (with dark cross-bandage on the end) of the dark silver-seagulls well lifts off.
Food-acquisition Silver-seagulls were pronounced fast and largely adjusted the environment-conditions changed through the human being. they like to look for its feed in the wastes of the garbage dumps, that fish-factories and behind fisher-boats, however, various invertebrate, dead animals and even vegetable food take in less "cultivated" biotopes to itself. While they cannot carry diving off any fish because of its fully different body-proportions from the nosedive, as the terns do it, out, silver-seagulls are able to gut squabs and nests of other seabirds with its powerful beaks, however. they mean for less adaptable and in the changed coast-landscape consequently strongly pressed and from the, at least local, dying out threatened seabird-types a considerable danger as soon as many brood-pairs meet to colonies.
Individual silver-seagulls against it don't represent any danger for larger brood-accumulations of other bird-types and are expelled even frequent from its own nest. In areas, where the silver-seagull-continuance gets out of hand very much, the human being intervenes into the continuance regulating through controlled Eierabsammeln, all the different brood-birds one, to protect little.
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