Wolves across much of the region were removed from the endangered species list earlier this year.
Public hunts for the predators — the first in the Lower 48 states in decades — are scheduled to begin Sept. 1 in parts of Idaho and two weeks later in Montana. Combined, the two states have authorized hunters to take 295 of the region's estimated 1,350 wolves, or about a fifth of the total population.
Wolf hunting permits went on sale Monday in Idaho.
U.S. District Judge Donald Molloy says he'll host a three-hour hearing Aug. 31 to hear arguments in the case.
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