It’s incredibly difficult to get accurate population estimates of any wild animal, even deer and elk which are both relatively easy to find. Wide ranging, low density, reclusive animals like wolverine (and lynx and grizzly bears at that) are difficult to study. However, there’s enough quality data present to make inferences about their general numbers and distribution based on surveys and habitat information. I would suspect higher quality data may never be forthcoming. Remember, there’s been a lot of folks working in this critter for many many years prior to this listing action. The general public just never cared enough to pay attention. Heck, the general public still has no idea southern mountain caribou are extinct in the lower 48, if they even knew they existed in the first place. I digress…