最具攻击性的鲨鱼种类是牛鲨。
“牛鲨因其极具攻击性而闻名，”兰德里说到。
"The bull shark is known for its aggressiveness," Landry says.
佛罗里达国际大学的麦克？黑萨斯研究牛鲨。
Mike Heithaus from Florida International University studies the bull.
牛鲨能逆流而上数千英里进入密西西比和亚马逊河。
Bulls have been found thousands of miles upstream in both the Mississippi and Amazon Rivers.
这是一个非常恰当的描述。牛鲨非常顽强和具攻击性。
It's a fitting description. Bull sharks can be tenacious and aggressive.
最危险的虎鲨、牛鲨和大白鲨。它们咬一口确实能让人丧命和失去肢体。
Sharks may bite people out of hunger, but often as not, they'll bite out of simple curiosity.
牛鲨以性情反复而且常有攻击行为而闻名，因此它们在居住区的出没让人担忧。
Bull sharks are known for their unpredictable and often aggressive behavior, so their presence in populated areas is a concern.
它们的体型没有大白鲨那么大，但雌牛鲨能长到11英尺以上，重达500磅。
They're not as large as the great white, but female bulls can grow to over 11 feet and weigh up to 500 pounds.
在澳大利亚伊普斯维奇郊区古纳，有人看到牛鲨游过麦当劳、肉店以及其他地方。
Bull sharks have been observed swimming past a McDonald's restaurant, past a butcher's shop, and around other places in Goodna, a suburb of the city of Ipswich, Australia.
其中包括湄公河巨型鲶鱼，体型可比牛鲨，以及湄公河黄貂鱼，体重可达600千克。
Among them is the Mekong giant catfish, which is the size of a bull shark, and the Mekong stingray, which can weigh up to 600kg.
只有三种鲨鱼会攻击人类。巨大的大白鲨、迅捷圆滑的虎鲨和常被忽视但很危险的牛鲨。
There are only three sharks that regularly attack humans. The massive great white, the swift, sleek tiger, and the often-ignored, but dangerous, bull shark.
牛鲨曾经沿如密西西比河逆流而上数百里，也可以在远离大海的淡水区域发现它们的踪迹。
It's been known to swim hundreds of miles upstream in rivers like the Mississippi and can be found in fresh water many miles from the ocean.
但对于鲨鱼和我们来说，数据显示牛鲨确实喜欢在我们每年夏季嬉戏的浅水区捕猎和出没。
But in regards to sharks and us, it showed that bulls do like to hunt and hang out in the same shallow waters we flock to every summer.
虎鲨和牛鲨是在墨西哥湾比较常见的两种鲨鱼，大白鲨比较少见，而白鳍鲨几乎不出现在浅水区。
Tiger sharks and bull sharks are common in the Gulf of Mexico, but it's rare to see a great white, and the oceanic white tip sharks are almost never seen in shallow waters.
科学家做了一项最新的研究，他们对17种鲨鱼的视网膜进行了研究，这些鲨鱼被捕获于澳大利亚东海岸和西海岸，其中有虎鲨和牛鲨。
In a new study, scientists looked at the retinas of 17 shark species caught off the coasts of eastern and western Australia, including tiger sharks and bull sharks.
为了向我们展示这里水域生态系统的健康程度，船长时而让我们看着从水中腾空而起的两米长的牛鲨，时而让我们注意候盘旋在头顶的栗鸢。
As evidence of the river system's health, our skipper points out a 2m bull shark as it leaps skyward and a brahminy kite wheels overhead.
鲨鱼的种类有很多，而经常被载攻击人的只有四种 –牛鲨（学名白真鲨）、虎鲨（学名居氏鼬鲨）、大白鲨（学名噬人鲨）、白鳍鲨（学名灰三齿鲨）
While there are numerous types of sharks, only four are most frequently cited in encounters with humans—the bull shark, the tiger shark, the great white shark and the oceanic white tip shark.
鲨鱼的种类有很多，而经常被载攻击人的只有四种 –牛鲨（学名白真鲨）、虎鲨（学名居氏鼬鲨）、大白鲨（学名噬人鲨）、白鳍鲨（学名灰三齿鲨）
While there are numerous types of sharks, only four are most frequently cited in encounters with humans—the bull shark, the tiger shark, the great white shark and the oceanic white tip shark.
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