全世界有鼠类2800多种,约120亿只,是数量最多、生命力最强的哺乳动物。它能适应各种环境,什么地方都能居住,无所不食,原子辐射也不怕。人走到哪里,它就跟到哪里,船舰、飞机也能上,在南北极照样生存。一代生命约一年,一对每年理论繁殖力达1.5万只。由于天敌蛇、猫、猫头鹰、鼬的捕食,抑制其生长,使其维持适当的数量,不致危及人类的生存。 There are more than 2,800 rodents and about 12 billion rodents all over the world. It is the most abundant mammal with the most vitality. It can adapt to a variety of environments, where to live, omnipresent, atomic radiation is not afraid. Where people go, it just follow where, ships, aircraft can also survive in the North Pole. A generation of life about a year, a pair of theoretical fertility of 15,000. Owing to the predation of natural enemies, such as snakes, cats, owls, and ferrets, their growth is inhibited and maintained in an appropriate quantity so as not to endanger human survival.