Terrestrial (land) mammals are those warm-blooded furry creatures that live on land. From tiny shrews to 1,200 pound (544 kg) Roosevelt elk, Redwood National and State Parks (RNSP) are home to a wide variety of terrestrial mammals. There are 66 known species of terrestrial mammals in Redwood National and State Parks, including 13 species of bats and one non-native species–the Virginia opossum. These mammals either reside in the parks year-round or, as in the case of bears and larger forest carnivores, occupy home ranges overlap park boundaries. Some terrestial mammals, particularly bats, reside in the parks only during the breeding season or during migration.