写海洋动物的英语作文篇五：

　　Orcas are not related to whales at all, other than being ocean-dwelling mammals. Rather, they are close kin to dolphins. While it was believed that they were a single species, recent research indicates that they may, in fact, be comprised of several different species of Orca. You can find them in every ocean in the world, though they tend to favor the colder waters around Antarctica and the North Atlantic or Pacific. The only predator they possess is humankind. While there's a deadly standoff between the two species, Orcas proliferate in the wild, and have an incredible life span. The males usually live as long as sixty or seventy years, while the females—who are excluded from the sometimes-violent competition for mates—may live a hundred years or more in the wild.

　　虽名虎鲸，但不同于海洋其他哺乳动物，非鲸目，海豚科的近亲。此前一直认为虎鲸只有一种，但最近的调查显示虎鲸种类繁多。部分虎鲸会终年停留于南极、大西洋北部和太平洋等温度较低的海域，但总体来看，它们的活动范围几乎覆盖全世界水域。它们堪称海上霸王，唯一的天敌也只有人类了。虎鲸全年都可以交配，数量庞大，雄鲸的平均寿命在60到70年左右，野生雌鲸不同于雄鲸经常参与猎杀食物，寿命可达100年甚至更长。

　　They've been observed reaching speeds of around 30 miles per hour, although some Orcas may utilize much greater bursts of speed, based upon their favored prey. Resident pods in the Pacific Northwest have shown a decided preference for salmonids—specifically, Chinook salmon. This presents a conflict with the goals of companies that rely on high yields of salmon for profit. Several communities of killer whale seem to favor beach and ice floe ambush approaches, snatching seals and walruses or even sea birds from their resting places. Others, located in the Southern Hemisphere, take up the challenge of hunting sharks in the open sea, as well as feeding on species of rays and other fish abundant in the cold southern waters.

　　虎鲸约时速30英里，当然也有爆发力更强的，为了追捕中意的猎物，时速可以更快。太平洋西北海域的虎鲸族群偏爱三文鱼，尤其是大鳞三文鱼。这就和沿岸经营三文鱼生意的公司产生一定的利益冲突。虎鲸族群喜欢在浮冰区伏击猎物，捕杀海豹、海象或者在这里歇脚的海鸟。在南半球海域里，有些虎鲸还会在公海里捕杀鲨鱼，也会以鳐和其他鱼类为食。