Mojave Desert - Desert Wildlife and Plants, also some information on the climate and geology
Crosote Bush Scrub - Plant and animal life in the Creosote Bush Scrub, in California it covers the south eastern desert.
Desert Bioregion - Climate, natural features, plants and animals of the California Desert region
Modoc Bioregion - Plants, animals, climate, and natural features of the Modoc regions, the high and dry sagebrush steppe country in northern California.
Desert USA - This site has a lot of information on the different California deserts. It also has a lot of pop up ads so might be good to use this site with an adult nearby. Move your cursor to "Deserts" at the top. When the drop down menu appears put your cursor on "Deserts of the US" then select the desert you are interested in. Find information on the plants and animals of the desert.