Over the past 15 years the Alaska Deot of Fish and Game, with the assistance of the Air Force and Army who own all of the land immediately north of the city of Anchorage and well up into the Chugach Mountains to the east, have been studying the bears that inhabit the city, bases, and surrounding area. After fitting a few dozen bears, including a thousand pound monster, one of their biggest surprises was that the bears descend into the congested parts of the city, even the downtown area, and essentially live in the greenbelts when the salmon arrive. And they do so, for the most part, without even being seen by the people. How do they do it? They fish the creeks at night, then go into the bushes and sleep all day long while people walk, ride bikes, skate, and travel the bike trails a few yards away. Then when the salmon runs subside, the bears head back up into the mountains to feast on the berries before winter.
There are an estimated 300+ black bears and 60+ brown/grizzly bears within the municipality borders at any one time. The original Urban Bear study began in 2005. There have been at least three more since. Here's a link to one of the more recent studies of 9 bears.
http://www.adfg.alaska.gov/index.cfm%3Fadfg%3Dlivingwithbears.anchorageurbanbearsstorymap