Why do some desert animals stay underground during the day?

Many desert animals are nocturnal or crepuscular, but burrowing gives them an even stronger refuge from the extreme daytime environment. Underground temperatures change more slowly than the surface, and soil can trap moisture. Animals such as fennec foxes, kangaroo rats, and many insects use burrows, shaded crevices, or tunnels to escape heat and predators. Some even seal themselves into burrows during the hottest or driest periods. This behavior is a key survival strategy in deserts where surface temperatures can become dangerous.