The fate of wolf de-listing is once again heading to the courtroom after an environmental group filed an appeal of the congressional decision to de-list the animal in Idaho, Montana and three other states. Wolves had been taken of the Endangered Species List this spring. Earlier this month, a judge criticized the move but ruled that it was constitutional. The Alliance for the Wild Rockies appealed the congressional decision to the ninth circuit court of appeals Monday. Hunting seasons to reduce wolf populations have been established in both Idaho and Montana. While the congressional action did not include wolves living in Wyoming, Wyoming officials and representatives of the US Department of Interior reached a separate tentative agreement earlier this month that could potentially lead to the de-listing of wolves here.