An adaptation is a feature of an organism that helps it to survive and reproduce in it's environment. An adaptation can be physical such as the large ears on the desert rabbit pictured below, functional such as the deserts plants ability to perform photosynthesis at night time instead of daytime or behavioural such as a lizard burying itself in the sand to escape from the heat.
Plants and animals living in the Mojave Desert are under constant stress due to extreme temperatures and low water supplies. Survival depends on their ability to cope with these stresses. Although many would think that there is little wildlife in the Mojave Desert, it actually contains many different forms of animals including mammals, reptiles, birds, insects and plants. All these organisms have adapted to this extreme environment in a variety of ways including by adjusting their behavior, nocturnal activity and conserving water loss.