Status and Trends

Reports & Publications

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Subtopics

Mammals

Ungulates (hoofed mammals) Carnivores

Related Subjects

Data Management

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Mammals+Field Recording

Did You Know...?

Bat Research in California
Bats reduce the need for chemical pesticides. Bats normally eat about half their weight in flying insects each night. Most species of North American bats feed on flying insects, including mosquitoes. A single little brown bat can eat as many as 600 small insects in an hour. Some of the largest colonies of Mexican free-tailed bats consume more than 100 tons of insects during spring and summer nights.

3 Total Items

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Evaluation of Water Level Reduction as a Habitat Management Tool for the Upper Mississippi River

Publisher: USGS | Science Center: Upper Midwest Environmental Sciences Center (UMESC, LaCrosse) | Format: URL

www.umesc.usgs.gov — The diversity of habitat types, plants, and animals in the Upper Mississippi River has declined considerably over the last 50 years, creating loss of aquatic vegetation, loss of islands and side channels behind dams, and changes in river sediments, potentially caused by the method of managing water levels, which maintains artificially high water More...

Assess Demographic and Physiological Status of Columbian Black-tailed Deer in Olympic National Park

Publisher: USGS | Science Center: Forest and Rangeland Ecosystem Science Center (FRESC, Corvallis) | Format: URL

fresc.usgs.gov — Biologists and managers on Washington's Olympic Peninsula, as throughout western Washington, are concerned about increased observations over the last several years of emaciated deer with symptoms of excessive hair-loss. This Web page describes a study to evaluate modern pellet-group survey methods, estimate abundance of deer and elk, identify More...

Mountain Lion Research on the Colorado Front Range

Publisher: USGS | Science Center: Fort Collins Science Center (FORT, Ft. Collins) | Format: URL

www.fort.usgs.gov — As one of one of the big three charismatic predators in North America, mountain lions top the list of national park management challenges that require balancing the preservation of species with protection of park visitors. In Rocky Mountain National Park and its environs, USGS Fort Collins Science Center (FORT) scientists are collaborating with More...