Do you know that...

    Chickens are only animals have combs, a piece of red flesh on the top of their heads. And, they can only fly a few yards because of their heavy bodies.

    Shrimps are also called prawns, and there is no distinctions between prawns and shrimps.

    Ants are important in maintaining the balance of nature. They eat large numbers of insects and help them from being plentiful. They eat more than half the termites hatched each year to keep them from destroying many homes. In turn, they are important food source for birds, frogs, lizards, and other animals.

    Bees are important for plants because of pollination. Pollination is the transfer by bees of a pollen from a flower to another flower thus helping them grow into another same kind of a flower.

    The beautiful colors and patterns on the wings of butterflies have useful purposes: It is for other butterflies to distinct them; It is for absorbing the sun's heat which they need to live; It is to hide from enemies such as birds or other animals; It is to warn the enemies that they have disagreeable taste and should not be eaten.

    The cicada has no jaws and does not bite or chew. Its mouth, like a mosquito's, is adapted to piercing and sucking plant juices. It never migrates but flies, mates, and dies within a short distance of the spot it emerged as a nymph.

    The dragonfly helps man because it eats harmful insects such as mosquitoes. And, it is the terror of the insect world.

    Flies are among the dangerous pests. They carry germs that cause such serious diseases as malaria, sleeping sickness, and typhoid fever. They usually bites when they touch any objects.

    You cannot make the turtle your pet because they carry bacterias that cause Salmonella Poisoning, a serious illness in human beings. 

    Giraffe's strong hoofs can kick in all direction and can kill the mighty lion. It can close its nostrils completely to keep out the sand and dust during sand storms in the plains.

    Kangaroo's huge hind legs can sail over a nine-foot fence with ease or beat off a dozens of dogs. The twitch of his tail can break a man's leg like a matchstick.

    Frogs are called amphibians because they can stay both in water and on land. Male frog clings on female frog's back and fertilizes the eggs as she lays them.

    你是否知道------

    * 雞 雞是唯一具有頭冠的動(dòng)物,一塊紅色的肉片點(diǎn)綴在頭上。而且,因?yàn)樗麄兩眢w過(guò)重,所以飛不高也飛不遠(yuǎn),距離僅僅幾碼之遙。

    * 蝦 小蝦也稱(chēng)對(duì)蝦,而且對(duì)蝦與小蝦之間并無(wú)區(qū)別。

    * 螞蟻  螞蟻在維持自然平衡中起著重大作用。它們吃掉大量的昆蟲(chóng)而又有利于它們不會(huì)存在過(guò)多。它們吃掉每年孵出一半以上的白蟻從而防止許多房屋不受損壞。反過(guò)來(lái),他們又成了鳥(niǎo)類(lèi),青蛙,蜥蝎及其他動(dòng)物的重要食物源。

    * 蜜蜂  因?yàn)槊鄯涫诜?所以它對(duì)植物的繁殖非常重要。傳授花粉就是蜜蜂把一朵花中的花粉傳遞到另一朵花中,這樣就幫助植物生長(zhǎng)出另外一種相同的花來(lái)。

    * 蝴蝶 蝴蝶兩翼上美麗的顏色和圖案極有用意:幫助其它蝴蝶辨別它們;有助于吸收它生活所需的太陽(yáng)熱量;可以隱蔽天敵如鳥(niǎo)類(lèi)及其它動(dòng)物;還可警示天敵表明它們有令人不快的氣味并且不該吃。

    * 蟬 蟬沒(méi)有鄂,既不能咬也不能嚼。它的嘴如同蚊子的嘴,適于穿刺,吸吮樹(shù)汁。它從不遷移但會(huì)飛,能配對(duì),而且蛹蛻后沒(méi)多久就死去。

    * 青蜓 因?yàn)榍囹殉杂泻Φ睦ハx(chóng)如蚊子等,所以它有益于人類(lèi)。反過(guò)來(lái),它卻是昆蟲(chóng)世界里的難對(duì)付的家伙。

    * 蒼蠅 蒼蠅屬于危險(xiǎn)的害蟲(chóng)。它們攜帶病菌,這些病菌會(huì)引起嚴(yán)重疾病如瘧疾,昏睡病和傷寒等。它們一旦碰到什么通常都會(huì)咬。

    * 海龜 你不可以把海龜當(dāng)作你的寵物,因?yàn)樗鼣y帶能引起沙門(mén)氏桿菌感染的細(xì)菌,沙門(mén)氏桿菌中毒癥可是人類(lèi)的一種嚴(yán)重疾病。

    * 長(zhǎng)頸鹿 長(zhǎng)頸鹿強(qiáng)勁的蹄可以朝向任一方向踢去并且可以踢死強(qiáng)有力的獅子。在平原里,當(dāng)風(fēng)沙四起,塵暴翻滾時(shí),它可以完全遮蔽鼻孔,擋住塵沙。

    * 袋鼠 袋鼠的巨大后腿可以輕易躍過(guò)一個(gè)九英尺高的防護(hù)墻或者擊敗幾十只狗的攻擊。它的尾巴猛力一抽擰斷人的腿如同折斷一根火柴。

    * 青蛙 青蛙被稱(chēng)作兩棲類(lèi),因?yàn)樗鼈兛梢陨�活在水里也可以生活在陸地。雄蛙粘附在雌蛙的背上并且在雌蛙產(chǎn)卵時(shí)給予授精。