But the New York City version is a hybrid between a subterranean strain, which developed a taste for mammalian blood from sewer rats, and the more common aboveground version that prefers birds.

但纽约市的蚊子是地下版本和更常见的地上版本的混合，地下版本因为叮咬下水道的老鼠而开始喜欢哺乳动物的血液，而地上版本更喜欢叮咬鸟类。