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Colorado Parks and Wildlife researchers plan their hike up Raider Ridge to a bear den to study bears in an area near populated areas on March 6, 2017, in Durango. The researcher are working on a six-year study of bear behavior and bear and human interactions around the area.

Colorado Parks and Wildlife researcher Heather Johnson puts three black bear cubs back in the den with their mother on Raider Ridge on March 6, 2017, in Durango. Johnson is leading a six-year study to determine the influence of urban environments on black bear behavior and population trends.

A black bear cub is nestled safely in a den with his mother after Colorado Parks and Wildlife researchers studied the bears on Raider Ridge on March 6, 2017, in Durango. Researchers are working on a study to determine the influence of urban environments on black bear behavior and population trends.

Colorado Parks and Wildlife researcher Heather Johnson looks at the paw pad of a sow black bear outside her den, on Raider Ridge on March 6, 2017, in Durango. Johnson, is heading up a six-year study to determine the influence of urban environments on black bear behavior and population trends.

Colorado Parks and Wildlife researcher Lyle Willmarth works on taking off a tracking collar on a sow black bear outside her den on Raider Ridge on March 6, 2017, in Durango. Willmarth is part of a team woking on a six-year study to determine the influence of urban environments on black bear behavior and population trends.

Colorado Parks and Wildlife researcher Heather Johnson works on taking weight, measurements and vital signs on a sow black bear outside her den on Raider Ridge on March 6, 2017, in Durango. Johnson is heading up a six-year study to determine the influence of urban environments on black bear behavior and population trends.

Colorado Parks and Wildlife researcher David Lewis heads back down Raider Ridge near Durango after finishing a day studying bears in the area on March 6, 2017. Researchers are woking on a study to determine the influence of urban environments on black bear behavior and population trends.