自然界的物质分为生物和非生物两大类。前者具有新陈代谢、自我复制繁殖、生长发育、遗传变异、感应性和适应性等生命现象。因此，生物世界也称生命世界(Vivicum)。
动物英语优秀作文范文一：
Snakes
蛇
The snake is a long and thin animal that lives in grass or other dark places.
蛇是一种又长又瘦的动物，生活在草丛里和阴暗的地方。
A snake has no legs or feet, but it can move very fast on its stomach.
蛇没有腿和脚，靠胃部飞快的移动前进。
Snakes usually have green, yellow or black skins, which make them difficult for their enemies to find them.
蛇常常有绿色，黄色和黑色的皮肤，使得敌人很难找到他们。Some kinds of snakes live in water. They can swim as freely as fish.
有些蛇生活在水里，他们能像鱼一样飞速的游移。
Snakes are cold-blooded animals. In winter they hibernatein holes which are narrow enough only to hold the snakes' bodies. The snakes can sleep through a whole winter without eating and moving. They can not feel any pain. The hibernation period lasts about five months. When spring comes, the snakes come out and begin their normal life.
Snakes can take many things as food, such as mice, sparrows, frogs,birds' eggs, pests and so on. People sometimes can see a snake eat a sparrow. First it moves close to the sparrow, then it puts out its tongue and brings the sparrow into its mouth and swallows it, which makes a lump in the snake's body. After some time the lump disappears.
As snakes are dreadful-looking, people are afraid of them. Many people drive them away whenever they see snakes. But in Chinese fairy tales, snakes are by no means bad. They seem to have human feelings. They can change into pretty girls. People like and respect them. The most well-known is the story about the White Snake and the Blue Snake.
In fact, snakes are not as dreadful as they look. They can help us to kill mice and pests. They can provide us with delicious meat. Their blood is a good drink. Poisonous snakes are especially useful. We can make valuable drugs with them.
动物英语优秀作文范文二：
My Dog
I have a dog. My dog name is DuDu. DuDu is 9 years. DuDu is fat. It wears a white coat. DuDu has two big eyes and two small ears.
It has one short mouth. My dog is smart. I like my dog. Do you like it?
动物英语优秀作文范文三：
The bird and cat
Once upon a time. There was a house. Beside the house there was a bird cage. One day a cat went to eat the bird, So the cat jumped and hit the bird cage. The bird cage fell down to the ground knocking the bird cage‘s door open. The bird then flew away.
So the cat started to chase the bird and the dog chased the cat. However the bird flew on top of the tree.
So the cat started to climb the tree and the dog barked at the cat. Before the cat could reach the bird, the bird flew away. this caused the cat to fall out of the tree. The dog then ran away, The bird quickly flew back into his cage and the man from the house carried him safely home.
动物英语优秀作文范文四：
Dogs usually refers to the dogs, also known as dogs, a common canine mammals, is a close relative of the wolf.
Often referred to as "human best friend" is also the highest rate of keeping pets.
His life was about ten - more than three decades, in the absence of an accident, the average life span of small dogs to be longer.