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．Sen Otters off the Coast of California
sea otters off the coast of Californiahave an unusual method of getting food．They dive to the floor of the sea to find the shell－fish they like．
When an otter brings a shellfish to the surface of the water，he floats on his back and puts the shellfish on his chest．Then the otter digs the meat out of the shell with his teeth．
Sea otters are especially fond of shellfish with a very hard shell．When the otter brings up one of these，he also brings a stone．He puts the stone on his chest，holding the shellfish in his front paws．He takes a wide swing and smashes the hard shell on the stone．Then he has no trouble getting at the meat in the shell．
10．加利福尼亚近海的海獭
生活在加利福尼亚近海的海獭，其取食方法很不寻常，它们潜入海底去寻找它们喜欢的甲壳动物。
当海獭把一只甲壳动物挟持到水面时，就背朝下浮在水面上，把甲壳动物抱在胸前，然后用牙把肉从壳中剔出。
海獭尤喜食长有坚壳的甲壳动物。当海獭把这样一只甲壳动物带到水面时，同时也带上来一块石头。它把石头放在胸前，用前爪抓住这只甲壳动物。它大幅度地摆动一下身体，对着石头猛击坚硬的甲壳，然后，取壳中肉就没有麻烦了。
How the Falls of Iguau Was Discovered
In 1542，Alvar Cabeza de Vaca and his small band of soldiers guided their boats down a jungle river．It was the Iguau，which now marks the boundary between Brazil and Argentina．Never had the explorers seen a river so beautiful．
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At one point the men heard a strange rumble in the distance．It grew louder as they went on．Puzzled and afraid，they rounded a bend．Directly ahead of them the river vanished，plunging with a roar over the brink of a great chasm．
The men fought the swift current and managed to reach shore just in time to keep from being swept over the brink．Then they crept out on the wet rocks and looked into the churning caldron below．They had discovered the greatest waterfall that had ever been seen by white men－the falls of Iguau．
12．伊瓜苏瀑布是怎样被发现的1542年，阿尔瓦·卡维萨·迪·威卡和他的一小队士兵驾船来到一条丛林河的下游，这就是伊瓜苏河——现在巴西和阿根廷之间的边界河。这些探险家们从未看到过这样美丽的河流。
这时，士兵们听到远处传来一种奇怪的隆隆声，越往前走，响声越大。士兵们感到迷惑和恐惧，于是转弯绕行。就在他们的正前方，那条河却越过一个巨大断层的边缘，咆哮着急降而下，消失不见了。
士兵们与激流搏斗，及时到达了岸边，从而免遭被冲刷出断层边缘的厄运。然后他们爬到湿漉漉的岩石上，看着下面那口奔突翻滚的“大锅”。他们终于发现了白人从未见过的最大瀑布——伊瓜苏瀑布。
“成千上万人疯狂下载。。。
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