BOISE, Idaho (AP) — Five conservation groups on Wednesday filed a lawsuit in Idaho seeking to stop a federal agency from killing wolves in the state until a new environmental analysis is prepared.

Idaho-based Western Watersheds Project and four other groups in the 27-page federal lawsuit say the 2011 analysis by the U.S. Department of Agriculture's Wildlife Services is outdated. The agency and its state director, Todd Grimm, are named in the lawsuit. Grimm says the agency had no comment.

The groups say Wildlife Services killed at least 72 wolves in Idaho last year, mostly following reports of livestock depredation. The groups say changes in the understanding of wolves and ecosystems as well as changes in recreational hunting and trapping need to be considered in a new analysis.