The American bird Conservancy estimates that up to 500 million birds are killed each year by cats - about half by pets and half by feral felines.
美国鸟类保护协会估计每年有五亿只鸟被捕杀，家猫和野猫就捕杀了差不多其中的一半。
The American bird Conservancy estimates that up to 500 million birds are killed each year by cats - about half by pets and half by feral felines.
美国鸟类保护协会估计每年有五亿只鸟被捕杀，家猫和野猫就捕杀了差不多其中的一半。
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