According to a recent post in Cougar News about an article in the Ottawa Citizen written by Tom Spears, March 15, 2012, cougars have made a comeback in eastern Ontario. Rick Rosatte, a biologist with the Ontario Ministry of Natural Resources and Trent University in Peterborough, ON conducted a study from 2006 to 2010 that confirmed sightings. He suspects the cougars come from those in the wild, and those people had as pets decided to release them back into the wild. They prefer low density areas and prey upon the large deer population.
Myself, I'm pleased the wildlife are making a comeback in areas they deserve to live in. Although if the cougar population increases substantially then they will be reduced by hunters who are given permits by the Ministry. It's a shame they were almost hunted to extinction in the first place. But times are changing.