In the animal world there are beaver house design and construction division said, he made a very strong house, and there are several import and export, there are bedrooms, a restaurant, as well as dams. General beaver house built on the flood, the dam for storing water, protection of the hole, to prevent the invasion of predators, but also easy to transport food.
One day, beaver invited many friends to visit their new home, which got into a crocodile. Crocodile during a visit to see the beaver body fat, all their meat, greedy mouth water.
Crocodile asked beaver: "Mr. Beaver, you are so beautiful backdoor nest it?" Beaver know crocodile ill, wanted to tell it has several backdoor it, but I thought: You can not! So he took the path leading to the pit refers to the crocodile look.
During the night, furtive crocodile to think with mud to block the beaver family back door, so it is like to go through the front door, firmly put beaver eat, taste must be Mimi! Alligator bag with a lot of broken rice soil, add some water, tune into the mud, his back to the beaver climbing back door, climb ah climb, heavy mud was back, a little climb move, But the thought of the taste of beauty beaver meat, crocodile strength again, all the strength he finally climbed on a pile of branches and hay, I did not expect splash, fell into the beaver has long been buried good pit Lane.
The pit is deep and large, is digging mud left behind when beavers build nests, beavers covered with branches and hay, is dedicated to catch bad guys keep using. Crocodiles want to eat beaver, but beaver catch the bad guys off the pit, never to climb up.
河狸在动物世界中有房屋设计建造师之称，他自己造的屋子十分坚固，而且有好几个进出口，里面有卧室、餐厅，还有堤坝。一般河狸的屋筑在河滩上，堤坝用来拦蓄河水，保护洞口，防止天敌侵袭，也便于运送食物。
一天，河狸请来许多朋友参观自己的新居，其中混进了一条鳄鱼。鳄鱼在参观时，看到河狸身体胖胖的，浑身都是肉，馋得口水直流。
鳄鱼问河狸：“河狸先生，你这么漂亮的巢有后门吗？”河狸知道鳄鱼不怀好意，本想告诉它有好几个后门呢，可是一想：不能！于是就把通向地坑的通道指给鳄鱼看。
到了夜里，鳄鱼鬼头鬼脑地想用泥巴去堵住河狸家的后门，这样，它就好从前门进去，稳稳地把河狸吃掉，滋味一定是美美的！鳄鱼用破米袋装了许多土，再加些水，调成了泥巴，背在背上，向河狸家后门爬去，爬呀爬，感到背上泥巴很重，有点爬不动了，但一想到河狸肉滋味美，鳄鱼的力气又来了，他用尽全身的力气好不容易爬上了一堆树枝和干草上，没想到扑通一声，掉进了河狸早就埋好的泥坑里了。
这个坑又深又大，是河狸造巢时挖泥巴留下的，河狸用树枝和干草盖上，是留着专门捉坏蛋用的。鳄鱼想要吃掉河狸，却掉在河狸捉坏蛋的坑里，再也爬不上来了。
