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Black bears are generally smaller than grizzly bears, with males averaging around 275 pounds and females about 175 pounds, according to the state wildlife agency. Colorado once had both, but the last grizzly bear in the state was killed in 1979. Now, it’s home to an estimated 17,000 to 20,000 black bears in a habitat increasingly encroached upon by humans, creating the potential for more encounters, Colorado Parks and Wildlife said in a report.