A federal judge ordered the U.S. Fish and Wildlife Service to take its wolverine ruling back to the drawing board, and this time, apply the best-available science.

On Monday, Missoula federal district Judge Dana Christensen was stern and meticulous in his criticism of the 2014 USFWS decision not to list the wolverine as threatened. In his 85-page ruling, he said the USFWS decision was “arbitrary and capricious” because it purposely ignored the best-available science on how climate change and genetic isolation would negatively affect the elusive carnivore.