State wildlife officials estimate they have killed more than 40 bears this year that attacked humans or repeatedly encroached on urban areas.

科罗拉多州野生动物官员估计，他们今年已杀死了超过40头对人发起袭击或不断闯入城市区域的熊。

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He and his colleagues get such abundant data by volunteering to take in black bears that have developed a taste for foraging close to people and are about to be killed as menaces.

他和他的同事自愿收养了几头养成了在人类附近生活，本将因其威胁性而被杀害的黑熊，从而获得了大量数据。

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A particular concern is the association of humans with food; food conditioning could result in nuisance bears being killed for the safety concerns of the local residents.

特别注意的是人类的食品供应，食物调控可能导致多余的熊出于对当地居民的安全考虑而被杀。

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About 800 polar bears are killed by subsistence hunters each year, the U.S. says.

CNN: World rejects new protections for polar bears

Each year around 600 polar bears are killed there, mainly by native hunters.

BBC: Polar bear trade ban 'too close to call'

Around 400 bears a year are killed for this purpose.

BBC: CITES meeting to deal with species 'extinction crisis'