U.S. Forest Service

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This June 29, 2017, remote camera image released by the U.S. Forest Service shows a female gray wolf and two of the three pups born this year in the wilds of Lassen National Forest in Northern California. California wildlife officials said Wednesday, July 5, the female gray wolf and her mate have produced at least three pups this year in the wilds of Lassen County. (U.S. Forest Service via AP)

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This June 30, 2017, remote camera image released by the U.S. Forest Service shows a pup born this year in the wilds of Lassen National Forest in Northern California. California wildlife officials said Wednesday, July 5, a female gray wolf and her mate have produced this one and at least two other pups this year in the wilds of Lassen County. (U.S. Forest Service via AP)

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This June 30, 2017, remote camera image released by the U.S. Forest Service shows a female gray wolf and her mate with a pup born this year in the wilds of Lassen National Forest in Northern California. California wildlife officials said Wednesday, July 5, the female gray wolf and her mate have produced this one and at least two other pups this year in the wilds of Lassen County. (U.S. Forest Service via AP)

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A U.S. Forest Service fire fighter carries a rescued deer fawn away form a spreading blaze in the dense Prescott National Forest Friday, June 30, 2017 near Prescott Valley, Ariz. The U.S. Forest Service posted photos and a video on Facebook showing the Friday night rescue, where Hotshots rounded up two deer fawns. (Stephen Rhine/ U.S. Forest Service via AP)

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FILE - This undated file photo provided by the U.S. Forest Service shows a bull trout in the Little Lost River in Idaho. A federal lawsuit by an environmental group seeking to force federal agencies to analyze whether about two dozen dams operating in Idaho, Oregon, Washington and Montana are harming bull trout has been dismissed. (Bart Gamett/U.S. Forest Service via AP,File)

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FILE - In this December 2016 file photo provided by the U.S. Forest Service, B.J. Hill from Swift Creek Outfitters helps rescue his horse, Valentine, from a remote area in northwestern Wyoming. Valentine spent eight weeks in the wilderness after being left behind by an excursion company after getting sick. Prosecutors announced Thursday, Feb. 23, 2017 that they haven't found any evidence of criminal wrongdoing in the case. (U.S. Forest Service via AP, File)

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FILE - This undated file photo provided by the U.S. Forest Service shows a bull trout in the Little Lost River in Idaho. On Wednesday, Sept. 21, 2016, an environmental group filed a lawsuit contending two federal agencies are violating the Endangered Species Act by failing to analyze how roads and motorized trails could be harming threatened bull trout in the Payette National Forest in west-central Idaho. (Bart Gamett/U.S. Forest Service via AP,File)

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U.S. Forest Service firefighting crews work hotspots Thursday May 22, 2014 near Sedona, Ariz .The human-caused Slide Fire started Tuesday. (AP Photo/ Vyto Starinskas)

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In this Sunday, May 11, 2014 photo, a U.S. Forest Service spotter plane surveys the Signal Fire in the Gila National Forest, just north of Silver City, N.M. A sortie of air tankers and helicopters took advantage of a break in the windy weather Monday to drop water and fire retardant on New Mexico's first major wildfire of the season. (AP Photo/Silver City Daily Press, Dean Thompson)

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In this Jan. 15, 2014 photo, Norberto Munive cuts down a large pine tree near Sheridan Lake, S.D. The survey conducted by the U.S. Forest Service, South Dakota's Agriculture Department and Wyoming's State Forestry Division measured trees that were infected by pine beetles that left trees in the fall of 2012 and spread to new timber last year. (AP Photo/Rapid City Journal, Chris Huber)

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FILE - In this undated file photo provided by the U.S. Forest Service, the Rim Fire burns near Yosemite National Park, Calif. Researchers based at UC Davis’ Tahoe Environmental Research Center, the University of Nevada, Reno and three other universities began working as the Rim Fire was still smoldering last summer. The effort was to gauge how the massive blaze affected water clarity, algae nutrients, light transmission and the aquatic food web at lakes close to the flames and others downwind that were smoked out for weeks. (AP Photo/U.S. Forest Service, File)