It's been estimated in the U.S., in a tiny colony of big brown bats, that they will feed on over a million insects a year, and in the United States of America, right now bats are being threatened by a disease known as white-nose syndrome.
据估计在美国一小群的 冠蝙蝠一年就进食 超过一百万只昆虫。 现在在美国 蝙蝠正受到一种名为白鼻症的疾病威胁。