Underdogs: Prairie Dogs at Home Underground - National Geographic presents this rich site full of sounds and pictures, where you can learn about prairie dogs and explore a typical burrow. Prairie Dog Patch - A grass roots effort to preserve prairie dog habitat in Hastings, Nebraska. Arctic Ground Squirrels in Alaska - Images and information about Spermophilus parryii. Sciurus niger, Fox Squirrel - Mammalian species account from the American Society of Mammalogists. Extensive information on characteristics, distribution, fossil record, habitat, behavior, and other topics. European Squirrel Initiative - Founded in 2002, this scheme aims to win the support of European governments to secure the future of the red squirrel by controlling the grey squirrel. Ground Squirrels - Information on three Sonoran Desert species including their distinguishing features, habitat, feeding and life history. Sciuridae - Information from Wikipedia on the classification of the Squirrel family which includes tree squirrels, ground squirrels, chipmunks, marmots and the true flying squirrels. International Marmot Network - Information on the animals of genus Marmota (marmots, woodchucks) worldwide. Red Squirrel: Sciurus vulgaris - Information from ARKive including images and videos. Richardson's Ground Squirrels - Paper by DR Broussard, GR Michener and FS Dobson on the behavior, physiology, and natural history of Spermophilus richardsonii. Gray-footed Chipmunk (Tamias canipes) - Photograph, description, distribution in Texas and habits. Texas Antelope Squirrel (Ammospermophilus interpres) - Photograph, description, distribution in Texas and habits. Mexican Ground Squirrel (Spermophilus mexicanus) - Photograph, description, distribution in Texas and habits. Spotted Ground Squirrel (Spermophilus spilosoma) - Description, photograph, distribution and habits, from the Mammals of Texas. Thirteen-lined Ground Squirrel (Spermophilus tridecemlineatus) - Description, photograph, distribution and habits, from the Mammals of Texas. Rock Squirrel (Spermophilus variegatus) - Description, photograph, distribution and habits, from the Mammals of Texas. Black-tailed Prairie Dog (Cynomys ludovicianus) - Photograph, description, distribution in Texas and habits. Eastern Gray Squirrel (Sciurus carolinensis) - Description, photograph, distribution and habits, from the Mammals of Texas. Eastern Fox Squirrel (Sciurus niger) - Photograph, description, distribution in Texas and habits. Eastern Flying Squirrel (Glaucomys volans) - Description, photograph, distribution and habits, from the Mammals of Texas. Spermophilus tridecemlineatus - Student project on the thirteen-lined ground squirrel including classification, habitat, adaptation, nutrition, reproduction and interactions with other species. Black-tailed Prairie Dog: Cynomys ludovicianus - Many videos and photographs with details of classification, status, description, range, habitat, biology, threats and conservation. Mexican Prairie Dog: Cynomys mexicanus - Photographs and information from ARKive including classification, status, description, range, habitat, biology, threats and conservation. Utah Prairie Dog: Cynomys parvidens - Photographs and information from ARKive including classification, status, description, range, habitat, biology, threats and conservation. Himalayan Marmot: Marmota himalayana - Photographs and classification information from ARKive. Vancouver Island Marmot: Marmota vancouverensis - Photographs and information from ARKive including classification, status, description, range, habitat, biology, threats and conservation. Mexican Prairie Dog (Cynomys mexicanus) - Brief narrative from the Animal Diversity Web. Living with Wildlife: Tree Squirrels - The Washington Department of Fish and Wildlife provides information on the species found in the state and their interactions with humans.