I'm sorry MistyBlue bowed out of the thread. I was hoping one of our wildlife professionals would chime in, and she did. I wasn't aware there were migratory cougars on the east coast and would've liked to have learned more.
Well, I'm 47 and have spent a tremendous amount of time in the woods and have never seen one until recently. If you never see one that does not mean they do not exist.
Here is a fairly recent article on the subject which is interesting:
I have; it crossed the road in front of me (a ways ahead, not right in front). It was black, way too big to be a bobcat and had a long tail. Definitely a cat and not a coyote or a dog. This was several years ago in southern NH, near Newton.
I also know credible sources who have seen one in north-central NH, walking in the road, in the early morning.
That is interesting as I heard someone else saw a big black cat in Vermont. now that would have to be one that someone turned loose I would think.
I had a cougar cross the road in front of me about 30 minutes South of Moncton, NB. Gorgeous big cat! I reported it to Natural Resources and got laughed at for my troubles. I know many people who claim to have seen them throughout New Brunswick and Nova Scotia.