The biggest whale is ________ blue whale，which grows to be about 29 meters long—the height of_百度知道
The biggest whale is ________ blue whale，which grows to be about 29 meters long—the height of
The biggest whale is ________ blue whalewhich grows to be about 29 meters long—the height of ________9­story building.A．the；the
B．a；aC．a；the
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请先输入下方的验证码查看最佳答案Whales - What is a Whale?-
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ALL ABOUT WHALES!
What is a Whale?
LIVING IN THE OCEAN
Whales are large, intelligent, aquatic .
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
(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.
The biggest whale is the , 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.
is the largest animal that has ever existed on Earth.
It is larger than any of the dinosaurs were.
They are also the
TWO TYPES OF CETACEANS
Cetaceans include the whales, dolphins and porpoises.
There are over 75 species of Cetaceans.
Whales belong to the order Cetacea (from the Greek word "ketos" which means whale), which is divided into the following groups:
- predators that use their peg-like teeth to catch fish, squid, and marine mammals, swallowing them whole. They have one blowhole (nostril) and use
There are about 66 species of toothed whales.
- predators that sieve tiny crustaceans, small fish, and other tiny organisms from the water with baleen.
is a comb-like structure that filters the baleen whales' food from the water.
Baleen whales are larger than the toothed whales and have 2 blowholes (nostrils).
There are 10 species of baleen whales.
SWIMMING AND OTHER WATER ACTIVITIES
Whales have a streamlined shape and almost no hair as adults (it would cause drag while swimming).
and Shortfin Pilot whales are the fastest, swimming up to 30 miles per hour (48 kph).
Whales swim by moving their muscular tail (flukes) up and down.
Fish swim by moving their tails left and right.
Breaching: Many whales are very acrobatic, even breaching (jumping) high out of the water and then slapping the water as they come back down.
Sometimes they twirl around while breaching.
Breaching may be purely for play or may be used to loosen skin parasites or have some social meaning.
Spyhopping: This is another cetacean activity in which the whale pokes its head out of the water and turns around, perhaps to take a look around.
Lobtailing: Some whales stick their tail out of the water into the air, swing it around, and then slap it on the water' this is called lobtailing. It makes a very loud sound.
The meaning or purpose of lobtailing is unknown, but may be done as a warning to the rest of the pod of danger.
Logging: Logging is when a whale lies still at the surface of the water, resting, with its tail hanging down.
While floating motionless, part of the head, the dorsal fin or parts of the back are exposed at the surface.
Many ceteaceans, especially baleen whales, migrate over very long distances each year.
They travel, sometimes in groups (pods), from cold-water feeding grounds to warm-water breeding grounds.
Gray whales make the longest seasonal migration of any of the whales. They travel about 12,500 miles each year.
SOCIAL BEHAVIOR
Cetaceans have very strong social ties.
The strongest social ties are between mother and calf.
A social group of whales is called a .
Baleen whales travel alone or in small pods.
The toothed whales travel in large, sometimes stable pods.
The toothed whales frequently hunt their prey in groups, migrate together, and share care of their young.
REPRODUCTION
Young cetaceans are frequently mottled in color, camouflaging them from predators.
Newborns have a sparse covering of hair which they lose as adults.
Cetaceans give birth to live young which are nourished with milk from their mothers - they don't lay eggs.
Cetaceans breed seasonally, usually in warm tropical waters, and females usually have one calf every 1-3 years.
The gestation times range from 9-18 months.
Whale calves can swim at or soon after birth.
Mother whales care for their young for an extended period of time, usually at least a year, feeding them milk and protecting them.
WHALE SONGS
Complex whales songs can be heard for miles under the water.
The humpback's song can last for 30 minutes.
Baleen whales sing low- toothed whales emit whistles and clicks that they use for
The songs are thought to be used in attracting mates, to keep track of offspring, and for the toothed whales, to locate prey.
CLASSIFICATION OF CETACEANS
Cetaceans are divided into the following suborders:
(toothed whales) -
, the beaked whales,
, and porpoises.
(mustached whales) or baleen whales -
These large whales are filter feeders and are among the largest animals on earth.
They have baleen plates instead of teeth, which are used to filter tiny organisms, like krill and small fish from the water.
They use their tongue to dislodge the food from the baleen and swallow it.
Baleen is made of keratin, the same protein that our hair and nails are made of.
Archaeoceti - the , which includes Basilosaurus, the earliest-known primitive Eocene whale.
PRIMITIVE WHALES AND EVOLUTION
evolved during the mid-Eocene period, about 50 million years ago.
Fossil remains indicate that whales evolved from hoofed land mammals - perhaps the shore-dwelling, hyena-like
that returned, bit by bit, to the sea roughly 50 million years ago.
Another possible step in whale ancestry is the otter-like , an extinct mammal the size of a sea lion, 10 feet (3 m) long and about 650 pounds.
Its limbs allowed it to swim and could also support it on land.
It had long, powerful jaws with shark-like teeth, a small brains, and a pelvis fused to its backbone (like land-dwelling mammals but unlike whales).
, a very primitive, extinct whale, had a tiny head and pointed snout with teeth, unlike modern-day whales which have large heads and a blunter snout.
It was about 82 feet (25 m)
ENDANGERED WHALES
There are many species of whales that are in danger of going extinct.
Most baleen whales (the huge whales targeted by commercial whalers) are listed as endangered or protected species.
Most other whale species are doing well and are not endangered.
Grade 3 - 5 Quizzes to Print
ALL ABOUT WHALES!
Information Sheets About Whales(and other cetaceans)
Just click on a cetacean's name to go to that information sheet.
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Wonderwise: Is A Blue Whale The Biggest Thing There Is
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Wonderwise: Is A Blue Whale The Biggest Thing There Is
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基本信息 书名:Wonderwise: Is A Blue Whale The Biggest Thing There Is 简单的科学：蓝鲸是最大的吗？——关于尺寸 ISBN 0 原价：82.00元 作者：Robert E. Wells 出版社：Franklin Watts 出版日期： ISBN：0 字数： 页码：32 版次：1 装帧：平装 开本：大16开 商品重量：0.4kg 编辑推荐
有趣有益的科学图画书，小朋友的科学启蒙老师！1996年获英国最高儿童读物奖斯马尔蒂斯奖银奖。1997年获英国《泰晤士报&教育特刊》（TES）知识类童书奖。1998年获英国隆普兰克奖少年科学图书奖提名奖。2000年获英国英语协会非虚构类最佳图画书奖。 快乐阅读《简单的科学》，原来科学是这么有趣！ “《简单的科学》系列是一套获奖的儿童科普丛书，它能激励孩子们充分发挥想象力，观察和发掘身边世界的奥秘”。 内容提要
如何通过数字和比例来理解“大”这个概念？从蓝鲸到珠穆朗玛峰（能装下2000头蓝鲸），从太阳到银河系，乃至整个宇宙。有趣的水彩图画，感性的图解认知，帮助孩子轻松认识世界。如果从1数到1000，大概10分钟就够了。但是从1数到100万，每天数10小时，大概要数3个星期。而从1数到10亿，需要用一辈子的时间。 目录
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