There are several living organisms that show adaptations in deserts such as:
Sidewinder Snake: Keeps the body cool by sliding sideways.
Golden Mole: Rarely emerges out from sand.
Sand Grouse: Fly long distances to fetch water.
Kangaroo Rats: Nocturnal animal that are active only during nighttime to stay away from extreme daytime heat.
Cactus plant: It has thick, waxy skin to reduce loss of water and to reflect heat. Also it has large, fleshy stems to store water. Thorns and thin spiky or glossy leaves help to reduce water loss. The spikes protect cacti from animals wishing to use stored water. Have deep roots to tap groundwater and long shallow roots which spread over a wide area.