In this photo taken Monday, April 18, 2016, a caution sign is posted near beehives on top of the Clift Hotel in San Francisco. At least seven San Francisco hotels have built rooftop beehives that produce honey for food, cocktails and spa products. Convention and tourist hotels from Union Square to Fisherman's Wharf say they're doing their small part to combat worldwide honeybee colony collapse. (AP Photo/Eric Risberg)

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