Geological Time Machine (UC Berkeley)
Global Climate Change (SF Exploratorium)
Hands-On Universe (UC Berkeley)
Journal of the Sierra College Natural History Museum
Nature: Weekly Journal of Science
NASA Jet Propulsion Laboratory
Saving the Sierra: Voices of Conservation in Action
Snowy Range Reflections: a Journal of Sierra Nevada History and Biography
Sustainable Communities Network
UC Berkeley Museum of Paleontology
Perissodactyls consist of a small order of herbivores, including rhinoceroses, horses and tapirs. They are distinguished from the other true ungulates - the artiodactyls - by their odd number of toes.