whale 英文简介最好是英文加中文的,介绍一下whale
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whale 英文简介最好是英文加中文的,介绍一下whale
whale 英文简介
最好是英文加中文的,介绍一下whale
whale 英文简介最好是英文加中文的,介绍一下whale
LIVING IN THE OCEAN
Whales are large,magnificent,intelligent,aquatic mammals.They breathe air through blowhole(s) into lungs (unlike fish who breathe using gills).Whales have sleek,streamlined bodies that move easily through the water.They are the only mammals,other than manatees (seacows),that live their entire lives in the water,and the only mammals that have adapted to life in the open oceans.
Whales breathe air.They are NOT fish.They are mammals that spend their entire lives in the water.
Cetaceans are the group of mammals that includes the whales,dolphins,and porpoises.Like all mammals:
Whales breathe air into lungs,
Whales have hair (although they have a lot less than land mammals,and have almost none as adults),
Whales are warm-blooded (they maintain a high body temperature),
Whales have mammary glands with which they nourish their young,
Whales have a four-chambered heart.
SIZE
The biggest whale is the blue whale,which grows to be about 94 feet (29 m) long - the height of a 9-story building.These enormous animals eat about 4 tons of tiny krill each day,obtained by filter feeding through baleen.Adult blue whales have no predators except man.
The smallest whale is the dwarf sperm whale which as an adult is only 8.5 feet (2.6 m) long.