If you're referring to their water sources, you're right by inferring that they cannot simply drink water as animals in a jungle can. Instead, they get their hydration from their food. A good example is a cactus; the interior of a cactus is quite juicy, which can provide enough hydration when consumed by animals.
Animals in the desert are no different from animals that do not live in deserts. Their bodies produce liquid, solid and gaseous waste that must be removed if the animal is to survive.
Desert Animals.
Fleas do not live in the desert per se. They live on animals as parasites and many times those animals are in the desert.
There are currently 4 animals that live in Siwa: The Desert Fox, the Desert Dear, the Desert Rat, and the Desert Bird You will be lucky to see such as these animals with your eyes, as these animals are so extinct
suck balls.... nah just kidding . desert animals are animals that live in the desert
Desert animals either feed on plants or they feed on other animals.
Antarctica is the biggest desert and the only animals that live there are penguins and seals and sea lions. Most of these live along the coast and not in the interior of the desert.
An ecosystem is a place where plants and animals ( maybe humans ) live and animals and plants live in the desert so … 
They are just adapted to live in the desert.
falcons , camel and sheep live in the hot desert...
Yes
Camels