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     DESERTS are the driest places on earth and sometimes go for months, or even years, without rain. But even the desert animals cannot survive without water, or for long periods in the scorching sun, so they have had to find different ways of coping with the harsh conditions. For example, gerbils spend the hottest part of the day in cool underground burrows. And strange insects called darkling beetles are experts at catching drops of moisture on their legs, then lifting them into the air until the drops trickle down into their mouths. Not all deserts are endless seas of rolling sand dunes. Some are rocky or pebbly and dotted with small bushes while others are sprinkled with colourful flowers during the spring.