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North America's bird population has plummeted

North America's bird population has plummeted. The journal Science says that the population has shrunk by three billion over the past 50 years. The worst declines have been ascribed to some of the most abundant birds. Sparrows, warblers and blackbirds account for almost three-quarters of the total losses. Other recordings show a one-third fall in shorebird numbers. The population of grassland types has also dropped over 50 per cent. The study was conducted through nine universities and government agencies in Canada and the U.S. It looked at 529 different kinds of birds. Researchers say there are many reasons for the drop, including habitat loss and toxic pesticides.

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