根据化石研究，地球上最早出现的动物源于海洋。早期的海洋动物经过漫长的地质时期，逐渐演化出各种分支，丰富了早期的地球生命形态。
优秀动物英语作文范文一：
Dogs狗
I like dogs.Many people like dogs.Dogs and people are friends.Some dogs also do different linds of work.Dogs are used to keep watch.They tell people when dangeris coming.Some dogs are used to keep people safe.
They sre also used to move animals like sheep or goats.Some dogs are used for different kinds of hunting and some dogs help the police.
优秀动物英语作文范文二：
My Pet 我的宠物
Recently, three owls appeared suddenly on our campus. They made me think of my pet from childhood.
When I was little, we had an owl at home. It was small, gray, and had two big eyes. We liked it very much. Every time I went home, it greeted me by making “goo-goo” sounds. We always played with it and talked to it. It would blink its eyes just like it understood what we were saying.
It was like my best friend. But when the weather became colder, we forgot to keep it warm, and it died. It made us sad for a long time, and it also taught me how important it is to take care of animals.
优秀动物英语作文范文三：
My favourite animal 我喜欢的动物
I like animals very much, such as horses,monkeys, cats, tigers and so on. But I like dogs best. Why? Because they are very cute and nice.
I have a white dog. Its name is Bobo. She is a female dog.She comes from Beijing,China.She wears white clothes and she has two big eyes and a small month.She often walks round and round at home.It has nothing to do.She likes eating ice-cream so much.So do I.When I eat ice-cream,she will look at the ice-cream carefully,So I will give her some to eat.
I think Bobo is the cutest dog in the world.
优秀动物英语作文范文四：
Save the Wild Animals
Many wild animals are facing the danger of extinction, because the environment that they are living in has changed greatly. For example, with the developmet of cities, the using of insecticide and serious pollution, their living areas have become narrowcr and narrower. Many of the wild animals, now are confronted with food crisis. At the same time, man is killing off species just for getting their fur, skin, horns, teeth and meat.
In order to protect our resources of ecology, people should realize that the loss of any species is at least the loss of source of knowledge and a source of natural beauty. There fore, measures of the following should be taken: pollution standards are made to keepdown poisons; killing off certain rare species is prohibited; national parks should be set up as wild life, reserves.
Only if we human beings take some drastic measures can wild animals be preserved.
保护野生动物
许多野生动物正面临绝种的危险，因为它们生活的环境发生了极大的变化。譬 如，随着城市的发展，杀虫剂的使用和严重的污染，野生动物的生活区域变得越来越狭小。许多野生动物目前正面临着食物方面的危机。同时，为了获取野生动物的 毛、皮、角、牙齿和肉，人类正在屠杀野生动物。
为了保护生态资源，人们应当意识到任何物种的缺失，至少意味着知识资源和自然美的缺失。因此，应采取以下措施：制订污染标准以降低有毒物质;严 禁杀害某些稀有物种;应建立国家公园作为野生动植物保护区。