Szukana fraza: [Abstract = "The number of House Sparrows has declined markedly in mid\-latitude western Europe in the last 25\-30 years. This was first noticed in Britain in farmland about 1979, though after a fall of about 60% the population appears to have stabilised at this lower level. It is now generally accepted that this decline was a consequence of reduction in the availability of food resulting from intensification of agricultural practices."]
