Swedish ecologists managed to prevent the complete disappearance of white-tailed eagles, the largest birds of prey that live in northern Europe.
About 40 years ago, white-tailed and Peregrine Falcons were on the verge of extinction because of pollution such dangerous chemicals, as insecticide DDT and polychlorinated biphenyls (PCBs), used, for example, as insulators in electrical engineering.
Once in 70 years under the threat of extinction, white-tailed units were counted on the east coast of Sweden. To save the Raptors Conservation Society organized a separate project.
For nearly 40 years, ecologists conducted a thorough, systematic surveillance of harmful chemicals and assessment of their impact on the environment. These studies have led to a ban on the use of DDT and polychlorinated biphenyls in 1975 in Sweden.
The number of eagles each year, in 60 locations along the lake Malaren and Hjalmaren. So, this year, experts here have counted about 150 white-tailed eagles and golden eagles, which is significantly more than what was observed in previous years.
"This reflects the fact that at the moment is an active environmental work, but we must not forget that a lot will also depend on future levels of harmful pollutants released into the environment by man" - quoted the words of the Swedish Radio Wall posts Ullerstada, specialist, controlling bird populations.
White-tailed Eagle (Haliaeetus albicilla) are birds of prey belonging to the family Accipitridae. Their difference from the Eagles is the presence of more massive beak and feathers lacking the bottom of the legs. Another distinctive feature of the eagle is the habit of settlements near large bodies of water, rivers and on the coast. And although most likely by the sea lives a minority of the entire world population of white-tailed eagles, that their feature strongly manifested in the name of the form that is in almost every language means "sea eagle."