Dolphins are aquatic mammals that are closely related to whales and porpoises. There are almost forty species of dolphin in seventeen genera. They vary in size from 1.2 metres (4 ft) and 40 kilograms (88 lb) (Maui's Dolphin), up to 9.5 m (30 ft) and ten tonnes (the Orca or Killer Whale). They are found worldwide, mostly in the shallower seas of the continental shelves, and are carnivores, mostly eating fish and squid. The family Delphinidae is the largest in the Cetacea, and relatively recent: dolphins evolved about ten million years ago, during the Miocene. Dolphins are considered to be amongst the most intelligent of animals and their often friendly appearance and seemingly playful attitude have made them popular in human culture.
关于鲸鱼的英语简介
The Dolphin is one of the most precious animals. Their bodies are very long. Dolphins live in the sea. They live on fish, shrimps and so on.
Dolphins are very friendly and peaceful. They never attack people. Instead, they have saved many people in danger. Dolphins are very clever.
People often train teem so that they can give a dolphin show which brings people a lot of happiness and joy.
海豚是最珍贵的动物之一 。他们的身体很长 。海豚生活在海里。他们住在鱼、虾等。海豚是很友好和和平 。他们从不袭击人 。相反,他们拯救了许多人处于危险之中。海豚是非常聪明的 。人们经常火车倒出,这样他们就可以给海豚表演这让人们大量的幸福和快乐 。
Whales are completely aquatic mammals。鲸鱼是完全水栖的哺乳动物 。They look very similar to fish 。外形看起来和鱼很相似。Their body length is usually between 1 and 30 meters 。身体长度一般在1米-30米之间 。
Their skin is bare, their snout has very little hair and their skin is thick with fat。仅吻部有很少的毛 ，皮下有厚厚的脂肪 。
These fats help maintain body temperature, and when they live in water, they reduce body weight and are good for swimming 。这些脂肪有助于保持体温 ，当它们在水中生活时，这些脂肪能减少身体比重，有利于游泳 。
扩展资料：
鲸鱼的种群现状：
由于环境恶化和人类的大量捕杀 ，鲸目成员特别是一些大型成员由于经济价值高而受到广泛捕猎 ，许多鲸类已濒临灭绝。国际捕鲸委员会（IWC）是一个负责管理捕鲸和鲸类保护的国际性组织 。在商业捕鲸导致鲸数量锐减后，IWC决定采取行动保护鲸类 。
其中包括从1986年开始暂时性禁止商业捕鲸 ，分别于1979年和1994年建立了印度洋鲸类保护区和南大洋鲸类保护区。然而从1986年以来 ，因为日本 、挪威等一些国家利用了IWC决议的漏洞，打着“科学捕鲸 ”的旗号每年捕杀了至少2,5000头鲸或海豚 。
百度百科—鲸鱼
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