Both warm-blooded and cold-blooded

暖血和冷血的沙漠动物都有逃避沙漠热的方法。温热的沙漠动物（例如老鼠）在白天休息，通常留在阴凉的地下洞穴中。在晚上，他们寻找食物。白天出门的动物，例如冷血的蜥蜴和蛇，仅在短期内活动。随着它们的体温升高，这些爬行动物进入阴凉处以降温。在傍晚，当太阳变得更弱时，爬行动物变得更加活跃，并再次开始寻找食物。<br>对于所有沙漠动物来说，获取足够的水生存是一个主要问题。一些沙漠动物，例如袋鼠大鼠和相关的哈巴狗，只能从他们所吃的食物中获取水。因为这些动物主要吃干种子，所以它们必须靠少量水生存。<br>大多数沙漠只有很少的青蛙和蟾蜍，因为这些动物必须靠近水才能生存。然而，即使这些生物也适应了沙漠条件。当少量水聚集在临时溪流中时，沙漠中的青蛙和蟾蜍开始活动。降雨后，他们产卵。卵在几天内长成t，在短短四个星期内长成成虫。当水坑干dry时，成年青蛙或蟾蜍会钻入地下。它们的新陈代谢减慢，并且一直停留在地下直到下一次降雨，可能长达一年。在此之前，他们的身体活动继续以较低的速度进行

Both warm-blooded and cold-blooded desert animals have ways to escape the desert heat. Warm-blooded desert animals, such as rats and mice, rest during the day, often staying in cool underground burrows. At night they search for food. Animals that are out during the day, such as cold-blooded lizards and snakes, are active only for short periods. As their body temperature rises, these reptiles move into the shade in order to cool down. In the early evening, when the sun grows weaker, the reptiles become more active and begin their search for food again.<br> Getting enough water to survive is a major problem for all desert animals. Some desert animals, such as the kangaroo rat and the related jerboa, get water only from the food that they eat. Because these animals eat mainly dry seeds, they must survive on a tiny amount of water.<br> Most deserts have only a small number of frogs and toads because these animals must be near water to survive. Yet even these creatures have adapted to desert conditions. When small amounts of water collect in temporary streams, the desert-living frogs and toads become active. After a rainfall, they lay their eggs. The eggs grow into tadpoles in a few days and into adults in just four weeks. When the puddles dry up, the adult frogs or toads dig into the ground. Their metabolism(新陈代谢) slows, and they stay beneath the ground until the next rain, which may be as good as a year away. Until then, their bodily activities continue at a reduced rate

热血和冷血的沙漠动物都有办法逃离沙漠的炎热。热血沙漠动物，如老鼠，白天休息，经常呆在凉爽的地下洞穴里。晚上他们寻找食物。白天外出的动物，如冷血蜥蜴和蛇，只在短时间内活动。随着体温的升高，这些爬行动物为了降温而进入阴凉处。傍晚时分，当太阳越来越弱时，爬行动物变得更加活跃，开始再次寻找食物。<br>获得足够的水生存是所有沙漠动物的主要问题。一些沙漠动物，如袋鼠和相关的跳鼠，只能从它们吃的食物中获得水。因为这些动物主要吃干燥的种子，它们必须靠少量的水生存。<br>大多数沙漠只有少量的青蛙和蟾蜍，因为这些动物必须靠近水才能生存。然而，就连这些生物也适应了沙漠环境。当少量的水聚集在临时的溪流中时，生活在沙漠中的青蛙和蟾蜍就会变得活跃起来。一场雨过后，它们产卵。这些卵在几天内长成蝌蚪，在4周内长成成虫。当水坑干涸时，成年青蛙或蟾蜍会挖到地里。它们的新陈代谢减慢，在下一场雨之前一直呆在地下，下一场雨可能就在一年之后。在那之前，他们的身体活动一直在减少<br>