The family from Plainville says they were playing with their dog in the backyard last month when the dog started growling and acting strange.
That's when they spotted the bear and took a video.
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They named him "Marty Barnard" and even set up an Instagram account for him that has since gone viral.
The family alerted the Department of Energy and Environmental Protection.
Officials told them to just leave Marty alone.
They said they could remove him from under the deck, but they couldn't promise he wouldn't return.
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