Elkhorn Slough - find info on natural history of both the marine and terrestrial flora and fauna of this beautiful coastal reserve 100 miles south of San Francisco. Also info on research, conservation, restoration, teaching materials, and info to plan a trip to the slough.
Monterey Bay Aquarium - can find natural history of some CA natives in the Animal Guide; marine mammals, birds, plant life, fish, octopi, invertebrates, and reptiles.
Ventana Wildlife Society - learn about condor and bald eagle restoration on this 80 acre preserve on the Big Sur coast.
Birds of the Central Valley - includes resources on bird species and migration, and tips on birding
Central Valley Grasslands - information from the World Wildlife Fund about the flora and fauna of California's Central Valley
Geology of the San Joaquin Valley - fossil and geology history of the Central Valley region