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------

* 鸡 鸡是唯一具有头冠的动物,一块红色的肉片点缀在头上。而且,因为他们身体过重,所以飞不高也飞不远,距离仅仅几码之遥。

* 虾 小虾也称对虾,而且对虾与小虾之间并无区别。

* 蚂蚁 蚂蚁在维持自然平衡中起着重大作用。它们吃掉大量的昆虫而又有利于它们不会存在过多。它们吃掉每年孵出一半以上的白蚁从而防止许多房屋不受损坏。反过来,他们又成了鸟类,青蛙,蜥蝎及其他动物的重要食物源。

* 蜜蜂 因为蜜蜂授粉,所以它对植物的繁殖非常重要。传授花粉就是蜜蜂把一朵花中的花粉传递到另一朵花中,这样就帮助植物生长出另外一种相同的花来。

* 蝴蝶 蝴蝶两翼上美丽的颜色和图案极有用意:帮助其它蝴蝶辨别它们;有助于吸收它生活所需的太阳热量;可以隐蔽天敌如鸟类及其它动物;还可警示天敌表明它们有令人不快的气味并且不该吃。

* 蝉 蝉没有鄂,既不能咬也不能嚼。它的嘴如同蚊子的嘴,适于穿刺,吸吮树汁。它从不迁移但会飞,能配对,而且蛹蜕后没多久就死去。

* 青蜓 因为青蜓吃有害的昆虫如蚊子等,所以它有益于人类。反过来,它却是昆虫世界里的难对付的家伙。

* 苍蝇 苍蝇属于危险的害虫。它们携带病菌,这些病菌会引起严重疾病如疟疾,昏睡病和伤寒等。它们一旦碰到什么通常都会咬。

* 海龟 你不可以把海龟当作你的宠物,因为它携带能引起沙门氏杆菌感染的细菌,沙门氏杆菌中毒症可是人类的一种严重疾病。

* 长颈鹿 长颈鹿强劲的蹄可以朝向任一方向踢去并且可以踢死强有力的狮子。在平原里,当风沙四起,尘暴翻滚时,它可以完全遮蔽鼻孔,挡住尘沙。

* 袋鼠 袋鼠的巨大后腿可以轻易跃过一个九英尺高的防护墙或者击败几十只狗的攻击。它的尾巴猛力一抽拧断人的腿如同折断一根火柴。

* 青蛙 青蛙被称作两栖类,因为它们可以生活在水里也可以生活在陆地。雄蛙粘附在雌蛙的背上并且在雌蛙产卵时给予授精。