Sequoia and Kings Canyon National Parks are home to 72 species of mammals. Commonly observed species include yellow-bellied marmots, mule deer, pika, and several species of squirrels, such as California ground squirrels, Douglas squirrels, golden-mantled ground squirrels, and western gray squirrels. Most mammals are secretive and nocturnal, and they are rarely seen by park visitors. Examples include ringtails, spotted skunks, short-tailed weasels, and mountain lions.