Wolves
Lots more now, like a snowball rolling down a hill.
Wolves make other predators, like felines, hungry.
They move the Elk around and chase them out of normal areas where felines would normally take them. Same for deer they hold tight down near the fields and houses and not up into feline / grouse territory.
Setting up my cams this spring/summer I noticed this in stark detail, there was a very finite barrier the deer dissappeared once I got up away from civilization.
A mile up in the woods the deer did not show on camera even over bait - this is very different than 5 or more years ago they'd have been all over it. I got Elk pictures and virtually no deer. If I went a 1/4 mile closer to civilization the deer would re-appear then if I got closer I got almost all deer pics.
Did you read the thread about the mushroom surveyor getting his dog chewed on?