誰說近視眼會影響殺傷力

05-11

Kingdom: Animalia

Phylum: Chordata

Class: Chondrichthyes

Order: Lamniformes

Family: lamnidae

Genus: Carcharodon

Species: Carcharodon Carcharias

One of the most fear animals of the sea

and the starring role of the Steven Spielberg movie Jaw, this shark is known

for its size, as the female can grow up to 20ft and the weight up to 1,950kg

this is just the female, while the males are smaller than the females ranging

from 13ft in length.

The body is in the shape of a torpedo

this makes them more aerodynamic in the water which helps them reaches speeds

up to 15mph compare that to French swimmer Frederick Bousquet who swam 50 in

20.94 seconds that』s the average speed of 5mph, so the average person would not

be able to outswim a great white shark.

The body of the

great white shark are seen with two different colours light blue on the top

half and white on the bottom, this is camouflage for the shark that has

developed over millions of years of evolutions, while the thinking how is white

and blue good camouflage. If you are above the shark and look down the colour

blue mixes with the darkness of the ocean and if you under the shark and

looking up the white belly mixes with the light from the sun so that it cannot

be seen by prey while it is swimming above or under the prey they are hunting.

The vision of the shark is very

poor but to make up for this shark hunt by scent and electric impulse that all

living creatures give off, one of the things people notice when a great white

attack is that is eyes change colour, this is the eyelid this protects the eye

so that it doesn』t become damaged while the eyeis normally dark

or black colour they will turn white which gives them a scarier look. The scent

is so powerful that the shark can smell a drop of blood in 100 litres of water

and sense the blood if its 3 miles away.

The shark has a row of 24 exposed teeth

but this is where something interesting happens, because if an animal loses its

teeth it will find it harder to hunt animals and could starve to death or choke

on food, so losing teeth is very bad but the great white has solved this

problem with and endless supply of regenerating teeth .

The life span of the Great White shark

has been estimated to be 70 years, which make it one of the longest lived

cartilaginous fish currently alive.

The Great White live in mostly coastal

waters in water that is between 12 and 24 C, the countries they surround are

parts of the United States, South Africa, Japan, Oceania, Chile and the

Mediterranean.

Baby great white sharks are called pups

but do not confuse these with puppies what baby dogs are called. While in the

womb of the mother the pups will eat their own teeth which helps they gain

strength and calcium, as soon as the pup leaves the mother it will be

independent and will go off on its own adventure finding smaller fish to eat.

中文翻譯：

界：動物界

門：脊索動物門

目：鼠鯊目

科：鼠鯊科

屬：噬人鯊屬

種：大白鯊

它是海洋中最令人不寒而慄的動物之一，它是斯皮爾伯格電影中的主角，它憑藉身長令人印象深刻，雌性可以長到4~5米，重量達到1950千克，當然這樣的噸位只針對雌性，雄性體長就會較小，通常3~4米。

大白鯊如魚雷般的身形，更符合水中的空氣動力學，有助於使它們的速度達到15公里每小時。50米自由遊記錄保持著法國選手弗雷德里克·布斯凱，50米遊了20.94秒，換算為5公里每小時，所以除非你是外星人，否則你的泳速不可能擺脫大白鯊。

大白鯊的身體通常有兩種顏色構成，背部那一半為淡藍色，腹部那一半為白色。這是鯊魚成百上千萬年進化出來的一種偽裝技術，如果你從上部往下看鯊魚，那它頂部的那片藍就與大海的顏色融合在一起；如果你從水下往上看鯊魚，那它白白的腹部與太陽光線又交織在一起，因此無論從上還是下，都讓獵物很難辨別大白鯊的具體方位。

大白鯊的視力相當差，可以用高度近視來形容，為了彌補這塊短板，大白鯊發展出了超群的嗅覺能力與能夠向任何生物發出的電脈衝。人們注意到當大白鯊發出攻擊時它的眼睛會改變顏色，其實是眼瞼起到了保護的作用，此時它的眼睛會從深色或黑色變成白色，起到一個震懾的作用，至於嗅覺能力，鯊魚能夠在100升的水中聞出一滴血的味道，即使隔了4800多米遠。

大白鯊有一排暴露在外的24顆牙齒，這也正是有趣的地方，因為如果動物少了它的牙齒，對於它進行狩獵就會變得非常困難，通常會餓死或者因為缺乏咀嚼能力而噎死，但大白鯊已經進化出解決這一問題的辦法，擁有了不斷再生牙齒的能力。

大白鯊的壽命預估可以活到70歲，也被認為現存能夠活得最久的軟骨魚類。

大白鯊大都生活在12至24攝氏度的沿海海域，通常在美國、日本、智利這些大洋洲及地中海國家的沿海城市出沒。

大白鯊寶寶被稱作pup,但是有別於小狗崽的那個pup.當大白鯊寶寶在母親的子宮內時，會吃掉自己長出來的牙齒，這樣有助於它們吸收鈣質並且獲得力量，一旦它們離開了母親就能很獨立地展開自己的冒險之旅，去獵殺那些更小的魚類。