The Department of Natural Resources estimates the minimum number of wolves at 618, based on survey results announced Thursday. That's down from previous estimates of 636 wolves two years ago and 687 in 2011.
But wildlife management specialist Kevin Swanson says when statistical error margins are factored in, the population likely has changed little if at all.
The survey is based on track counts and aerial observation of wolves wearing radio tracing collars.
Courts have rejected attempts to remove wolves in the Great Lakes region from the endangered species list.
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