Updated at 1:20 p.m. ET.
Social media has dubbed Arturo, a polar bear living in an Argentinian zoo, the "world's saddest animal," and more than 400,000 people have signed an online petition asking that he be moved to a "better life" in Canada.
Photos of Arturo, 29, looking distressed and lying flat out on his stomach that have circulated online prompted the petition. The bear's enclosure mate, Pelusa, died two years ago, the BBC says.