USGS Multimedia Gallery
Wolves
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Downward Facing Wolf
Adho mukha svanasana is the Sanskrit name for the downward facing dog yoga asana and this wolf shows how the pose got its name. The wolf's eyes, muzzle and paw tips are warm and yellow in this thermal image of a captive wolf at the Grizzly and Wolf Discovery Center in West Yellowstone. USGS scientis... 
Howling Wolf
A wolf howls in this thermal image of a captive wolf at the Grizzly and Wolf Discovery Center in West Yellowstone. USGS scientists are examining thermal imagery of wolves as one step in assessing impacts of sarcoptic mange on the survival, reproduction and social behavior of this species in Yellowst...
Warmth From the Sun
Note the bright red patch on the wolf's hindquarters in this thermal image of a captive wolf at the Grizzly and Wolf Discovery Center in West Yellowstone. This is where fur was shaved to replicate the loss of fur associated with sarcoptic mange. The fur will eventually grow back. USGS scientists are...
Aspen in Yellowstone National Park
Many aspen groves in Yellowstone National Park are failing to regenerate....
Wolf in Yellowstone National Park
Wolves were reintroduced to Yellowstone National Park in 1995 and 1996....
Wolf in Yellowstone National Park
Wolves were reintroduced to Yellowstone National Park in 1995 and 1996....
Wolf in Yellowstone National Park
Wolves were reintroduced to Yellowstone National Park in 1995 and 1996....
Brutus Dominance Behavior After Capture
A couple of hours after being immobilized for collaring, Brutus, a wolf being studied by USGS scientists, appears to have fully recovered. He returns to his pack mates and demonstrates dominance behavior over a younger male wolf. Note that Brutus has a stiff, aggressive stance and upright tail, whil...
Brutus Howling
Brutus, a wolf being studied by USGS scientists, separates from his pack mates and appears to be heading back to the den. He stops at the head of the fiord and howls for 2-3 minutes. The scientists track his progress with binoculars past the river where they cannot go. They suspect that his mate has...
Brutus' Teeth
Scientists examine the teeth of Brutus, a wolf being studied by USGS scientists, for patterns of wear that indicate age. The front incisors are worn without their lateral cusps present. The canines show some wear and are becoming rounded and stained but still maintain most of their length. One canin...
Dave Mech with Brutus
Brutus, a wolf being studied by USGS scientists, is chemically immobilized, measured, ear-tagged, and fitted with a radio collar near the Eureka airstrip on Ellesmere Island in the High Arctic, Nunavut, Canada. This radio collar will obtain two GPS (Global Positioning System) locations a day for 2 y...
Dave Mech Following Wolves
Late in the evening, two wolves make use of the trail that leads to the head of the fiord. Studying wolves in the High Arctic allows scientists to follow the wolves during their travels, assuming the scientists can keep up. All-terrain vehicles are needed, and the 24-hour daylight at this time of ye...
Brutus the North Pole Wolf
Brutus, a radio-tagged wolf being studied by USGS scientists, is a member of a pack of at least 12 adults and an unknown number of pups....
Brutus the North Pole Wolf
A mother wolf carries an errant pup back to their den....
Brutus the North Pole Wolf
USGS biologist Dave Mech has spent more than 20 summers studying Arctic wolves on Ellesmere Island, where they are unafraid of humans and can be observed at close range....
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Page Last Modified: Wednesday, January 09, 2013
