Most of the animals that live in the desert cannot live in the rain forest because of what they have survived through their entire life. And what they have been raised to eat will not be there so whatever it is you hear about desert animals can live in the rain forest they cannot, those are just some rumors, and there are a lot that say they can but if you don't trust us ask Google.
Clarification:
There are a number of organisms that can live in both. The coati, for example, the raccoon and many others are found both in deserts and in rainforests.
Of course they live! Not forever, but they adapted to where they can live long enough to reproduce and keep the population alive.
They will adapt. There are already many animals that live in both the rainforest and the desert - coatis, raccoons, jaguars, cougars, ocelots, to name a few.
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
the animals which live there.