Dry and Warmer from Today into Early Next Week
Monsoonal weather patterns have moved into the Grand Canyon area decreasing fire danger. As a result, on Tuesday, July 8 at 8 a.m. fire managers lifted fire restrictions within Grand Canyon National Park. More »
Two Bats Collected in the Park Have Tested Positive for Rabies
One on the North Kaibab Trail and the other at Tusayan Ruin/Museum. Rabies can be prevented if appropriate medical care is given following an exposure. Any persons having physical contact with bats in Grand Canyon National Park, please follow this link. More »
Of the 34 mammal species found along the Colorado River corridor, 15 are rodents and eight are bats. River otters may have disappeared from the park in the last decade and muskrats are extremely rare. However, an increase in the population size and distribution of beavers has occurred seen since the construction of Glen Canyon Dam. Beavers cut willows, cottonwoods, and shrubs for food, and can significantly affect the riparian vegetation. Other rodents, such as antelope squirrels and pocket mice, are mostly omnivorous, using many different vegetation types. Grand Canyon bats typically roost in desert uplands, but forage on the abundance of insects along the river and its tributaries.
In addition to bats, coyotes, ringtails, and spotted skunks are the most numerous riparian predators. They prey on invertebrates, rodents, and reptiles. Raccoon, weasel, bobcat, gray fox, and mountain lion are also present, but are much more rare. Mule deer and desert bighorn sheep are the ungulates that frequent the river corridor. Mule deer are generally not permanent residents along the river, but travel down from the rim when food and water resources there become scarce.
The mammalian fauna in the woodland scrub community consists of 50 species, mostly rodents and bats. Three of the five Park woodrat species live in the desert scrub community. Many generations of woodrats inhabit the same middens, which can serve as valuable indicators of past climatic conditions and associated vegetation. Numerous caves in the inner canyon provide roost sites for migratory and resident bats. Maternity colonies are especially prone to disturbance from human exploration, and greater efforts are needed to inventory park caves for bats and establish protective measures where necessary.
The conifer forests provide habitat for 52 mammal species. Porcupines, shrews, red squirrels, tassel eared Kaibab and Abert squirrels, black bear, mule deer, and elk are found at the park's higher elevations on the Kaibab Plateau.
It is illegal to approach or feed wildlife in Grand Canyon National Park
Related Information About Mammals
A Biologist’s Biologist: Remembering Eric York
Mountain Lion Research at Grand Canyon
Mammals of Grand Canyon NP (69kb PDF File)
Arizona Game and Fish Web Site
Did You Know?
The Cambrian seas of the Grand Canyon were home to several kinds of trilobite, whose closest living relative is the modern horsehoe crab. They left their fossil record in the mud of the Bright Angel Shale over 500 million years ago.