To be or not to be?
I've been following mountain lion rumors and sightings for the past 15 years or so, since I spent some time studying tracking with Paul Rezendes and Nick Wisniewski, 20 years ago. Two things I learned, and one distinction.
Two things learned:
1. There are many, many reports of mountains lions in New England every year. The vast majority of these do not pan out, for a variety of reasons. People who see something are excited, are inexperienced, do not know the difference between a bobcat and a puma, etc. There are/were a group of us who follow up on reports, check evidence (if there is any), and try to figure out what was seen. One "I'm sure it was a mountain lion" I checked out in Princeton MA 10 years ago must have been wearing coyote boots, because those are the tracks it left.
2. Confirmation requires hard evidence - video or clear photographs (there are very few photos and almost none are clear, such as the one that started this thread - it is out of focus and poorly lit, does not show the body and tail, does not provide scale, etc), scat (w/DNA), a carcass, clear observation by a trained wildlife biologist, etc. That said, there have been a half dozen confirmed sightings over the past 15-20 years in New England - DNA from a scat found in the Quabbin (McWhorter), DNA from Cape Elizabeth ME, a confirmed sighting by a wildlife biologist in Vermont, and a couple of others I'm forgetting. So there is hard evidence that mountain lions have been here in New England in the past 15 years.
The distinction:
Escaped (or released) pets are not a native population. They do not represent a population that is growing, breeding and establishing its habitat. Escaped pets are very likely to struggle to survive, and die after a short time, without breeding.
I'd love there to be a wild population of mountain lions in New England. As others have pointed out, the ingredients are there - extensive forested landscape, and a well (white-tailed deer) stocked larder. We've seen other species return to broad swaths of southern and central New England (moose, black bear) after being absent from those places for 150 years. But moose and black bear spread south from pockets of surviving populations in northern ME and eastern Canada. There's no close-by surviving pocket of mountain lions that I know of. The closest confirmed native populations are in the upper midwest, and north-eastern Canada.
Until we've got more proof, especially of a breeding population, I'll remain hopeful but skeptical. And looking forward to the next posting on this site, just in case. JR