鸭的体型相对较小,腿位于身体后方,因而走起路来摇摇摆摆。根据鸭的特有行为,鸭可分为钻水鸭、潜水鸭和栖鸭3个主要类群。栖鸭(如莫斯科鸭)有长爪,是最喜欢树栖的鸭。海洋种类的潜水鸭最多。绿头鸭是一种典型的钻水鸭,是大部分家鸭的祖先。绿头鸭春天从南方飞到北方产卵,秋天再飞到南方越冬。可是很久以前,有些绿头鸭被人类驯养后,便失去了迁徙的习性,而且人们为了获得更多的鸭蛋,不让它们停产孵蛋。时间一长,家鸭就失去了孵蛋的本领。 Duck's body is relatively small, legs are located in the rear of the body, so walking to swing. According to the unique behavior of ducks, ducks can be divided into three major groups of ducks, diving ducks and perch duck. Duck (such as the Moscow Duck) has long claw, is the most favorite arboreal duck. Diving ducks of marine species up to. Mallard is a typical ducks, is the ancestor of most domestic ducks. Mallards fly from the south to the north to spawn in spring and fly to the south in winter to winters. However, some long time ago, some mallards domesticated by humans, they lost the habit of migration, and people in order to get more duck eggs, do not let them stop production of eggs. Over time, Ducks lost their ability to hatch.