Scientists think that some animals become extinct because of changes in climate.The places where they live become hotter or cooler,drier or wetter.The food that they eat cannot grow there any more.If the animals can't learn to eat something else,they die.Dinosaurs may have died out for this reason.
Summary:
In the past two hundred years,many kinds of animals have died out.There are several reasons for it.First,people keep building houses and factories in fields and woods,which destroys animals'homes.Then,hunters'killing has also caused some animals to become extinct.Besides,some animals aren't able to bear strong offspring and nor do they have enough food to eat because of pollution and climatic changes.
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