DENVER -- Black bears kept wildlife officers busy Tuesday, showing up in trees in Boulder and in Weld County.

In the Boulder incident, a mother bear and her two cubs spent most of Tuesday sitting in trees near 19th Street and Kalmia Avenue, on the north end of town.

Residents in the area said the bear trio moved around during the day, drawing a large crowd of onlookers.

The three bears appeared to find the trees in the neighborhood just right.

The same sow bear with two cubs was reported by residents last week around Kalmia and Fourth Street on the western edge of town.

Wildlife officers said they had no plans to interfere with the bears and that the bears appeared to be scared of people.

Also on Tuesday, a mother bear and two cubs showed up on a farm north of Johnstown in Weld County.

They were also in a tree and may have been attracted to the area by a nearby corn field.

Division of Wildlife officer Troy Florian said the bears had probably been living near the cornfields and eating to get ready for winter hibernation.

“Bears will eat up to 20,000 calories a day, preparing for winter,” Florian told the Greeley Tribune. “They'll eat corn or berries or anything they can get.”

The three bears were left alone and eventually left the immediate area.

The only bear species flourishing in Colorado now are black bears, although they can appear as brown or cinnamon colored. There are an estimated 8,000 to 12,000 black bears in the state.

Grizzly Bears, also native to Colorado, were hunted to near extinction more than 100 years ago. The last grizzly killed in Colorado was in 1979, according to the Colorado Division of Wildlife. They are now classified as an endangered species in Colorado.