Only one kind of squirrel around the metro area I live and I think they came along with all the new transplants moving into the Colorado front range. They're projecting by 2050 Denver will grow to a population of 8.46 million and double in size. I remember back in around 1977 they made a big deal of Denver exceeding 1 million residence. That'll be a whole bunch more squirrels with new trees planted they can live in the future.