鸭类，包括北长尾鸭，被大量猎杀。
Duck populations , including Northern pintail ducks , are commonly hunted .
低致病禽流感病毒通常出现于野禽，并且可以在很多鸭类包括北长尾鸭中找到。
Low pathogenic avian influenza commonly occurs in wild birds and can be found in a number of duck populations including the Northern pintail .
长尾鸭