英语 main point

英语 main point
Some desert animals can survive the intense summer heat and dryness because they have very unusual characteristics.The camel,for example,can stand an increase in the temperature of its blood of 9*C.In addition ,it can drink an enormous amount of water at one time,then store a sufficient amount in its red blood cells and other parts of its body to supply its needs for two weeks or more.The Kangaroo rat,on the other hand,obtains all the water it needs from water that it produces when breathing.
However most animals need to maintain a fairly constant body temperature,and will die if it rises more than 5*C.Therefore,they need to find some way to avoid the intense radiations of the summer sun.Nor can many animals either store or produce water in their bodies ,as the camel and Kangaroo rat can.So they must find ways to reduce water loss form their bodies to a minimum.
Because very few desert animals can survive the high radiation,the temperature,and the evaporation rate of a typical summer's day,most of them are nocturnal.Only after the sun has set does the desert come fully to life.The night is relatively cool,and the darkness provides protection,not only from the sun,but also from other animals and from the birds,So the coming of darkness is the signal for the large majority of animals and insects to continue their search for water and food,When morning comes,most of them seek shelter again:many go underground; nearly all find somewhere shady where they can avoid the sun's radiation,if not its heat.要写main point 不知道该怎么写才好

The reason why some desert animals can survive the intense summer heat and dryness.