Black-headed gull (Larus ridibundus) a bird of 2008
Share article with friends All Rackova dlouhokridlych belongs to the Rules of Procedure, which are included, while birds of various sizes, but is a common feature - a long stihlymi wings.
Black-headed gull is one of the smaller to medium-sized species racks. It weighs between 200 to nearly 400 grams, has a long wing around thirty centimeters. Typical for him, although predominantly white body color, but with gray to black backs, hnedocerna mask on his head and the deep red legs, beak and eye ring. Iris eyes are hnedocerna. The ends of the wings are black and white contrast. According to the front edge of wing white gull chechtaveho can be distinguished from its related species, even when just nechechta.
The male and female are the same color. In winter plumage is similar hnizdnimu,only the head is white with a brownish picture of the eye.
Young birds are different from adults. They are greyish-brown, with longitudinal brown drawing on the wings as dark rim at the tail. Beak and legs are dirty yellow color to meat.
What are chechta gull?
Voice racks is very incisive and reverberate especially when they are together more - as in flight, especially in the nesting colonies. Birds sound issue with beaks wide rozevrenymi. Recalls remotely to human laughter, and it got gull species its name.
Rackum theory, however, do not be funny at all. According to regular surveys to continually reduce their stocks. According to the census of 1966 was only in South Bohemia racc 80 colonies with 30 to 40 thousand pairs,in 1977 to achieve the maximum - 100 colonies and 60 to 70 thousand pairs - and since then their stocks just falling: in 2002 there ornitologove counted only less than ten thousand pairs and 28 colonies. And the winter sites in Prague, where even in the nineties hniz-dilo 5 to 10 thousand racks, not this winter, almost no.
The reasons why black-headed gull is disappearing from our nature, are not accurately documented. Provided that in their declining incidence signed poisons contained in water and air, perhaps the findings racc dead pups with congenital defects, or surviving with a variety of diseases and the degree of deformity, which reduce their chances of survival into adulthood and a new functional pair.Toxins in their organisms receive the food they collect Rackova in fields treated with pesticides or heavy metals contaminated landfill.
Other reasons why racks less and less, is the loss of a suitable environment in the context of odvodnovanim wetlands, and, finally, direct persecution in the form of hunting, collecting eggs or intentional poisoning. It gull is clearly beneficial for agriculture because it disposed of in a large variety of insects in orbe or mowing meadows. Minor damage may occur in tresnovych gardens close to their hnizdist, rarely in pludkovych ponds.
Critical situation in which the black-headed gull was accidental,led to its inclusion in the Red list of the category of vulnerable species.
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