Arturo, the depressed polar bear, will not be removed from the sweltering climes of his Argentinian zoo, despite the rapid growth of a global petition that has amassed more than half a million signatures for him to be transferred to Canada.

The director of Mendoza Zoo in Argentina said on Tuesday that at the age of 28, Arturo is too old to be safely relocated.

The decision follows growing interest in the bear’s welfare, after animal rights groups, activists and visitors to the zoo have spoken out against the conditions that Arturo lives in, and Assiniboine Park Zoo in Winnipeg, Canada, has offered to give Arturo a better life.

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An online petition calling for Arturo to be relocated to the Winnipeg Zoo has had well over 500,000 signatures, which would see the Arctic bear living in a habitat far closer to his own.

Shape Created with Sketch. Arturo: the depressed polar bear Show all 9 left Created with Sketch. right Created with Sketch. Shape Created with Sketch. Arturo: the depressed polar bear 1/9 Arturo's home at Mendoza Zoo Arturo (the Spanish name for Arthur) is thought to be depressed. Getty 2/9 Arturo's home at Mendoza Zoo Arturo is lonely since his long-term companion Palusa died two years ago, and he is the only polar bear in the zoo. Getty 3/9 Arturo's home at Mendoza Zoo Experts say the way Arturo swings his head and bares his teeth is "abnormal" and they fear he is going insane. Getty 4/9 The polar bear's natural habitat can get as cold as minus 40 degrees, but Arturo is living in a climate that can reach highs of 40 degrees in the heat. Getty 5/9 Arturo's home at Mendoza Zoo He only has a shallow, tepid pool to swim in. Getty 6/9 Arturo's home at Mendoza Zoo Assiniboine Park Zoo in Winnipeg, Canada, has been trying to have Arturo transferred to its grounds, where he would live in better conditions and in a better climate. Getty 7/9 Arturo's home at Mendoza Zoo But Mendoza Zoo does not hold the necessary documents the Canadian authorities need in order to have Arturo transferred. Getty 8/9 Arturo's home at Mendoza Zoo He has been living in captivity at the zoo for 20 years. Getty 9/9 Arturo's home at Mendoza Zoo A recent assessment of Arturo concluded he is too old and his health too fragile to allow him to travel to a new home. Getty 1/9 Arturo's home at Mendoza Zoo Arturo (the Spanish name for Arthur) is thought to be depressed. Getty 2/9 Arturo's home at Mendoza Zoo Arturo is lonely since his long-term companion Palusa died two years ago, and he is the only polar bear in the zoo. Getty 3/9 Arturo's home at Mendoza Zoo Experts say the way Arturo swings his head and bares his teeth is "abnormal" and they fear he is going insane. Getty 4/9 The polar bear's natural habitat can get as cold as minus 40 degrees, but Arturo is living in a climate that can reach highs of 40 degrees in the heat. Getty 5/9 Arturo's home at Mendoza Zoo He only has a shallow, tepid pool to swim in. Getty 6/9 Arturo's home at Mendoza Zoo Assiniboine Park Zoo in Winnipeg, Canada, has been trying to have Arturo transferred to its grounds, where he would live in better conditions and in a better climate. Getty 7/9 Arturo's home at Mendoza Zoo But Mendoza Zoo does not hold the necessary documents the Canadian authorities need in order to have Arturo transferred. Getty 8/9 Arturo's home at Mendoza Zoo He has been living in captivity at the zoo for 20 years. Getty 9/9 Arturo's home at Mendoza Zoo A recent assessment of Arturo concluded he is too old and his health too fragile to allow him to travel to a new home. Getty

Arturo is believed to have become depressed after his long-term companion died two years ago. Since then, experts believe that his behaviour has become "abnormal". He is often seen swaying his head from side to side, pacing back and forth in his enclosure, while bearing his teeth.

Arturo’s thick coat of fur is designed for his natural habitat of icy sea water and temperatures as low as minus 40C, but in the baking heat of his Argentinian confines, the polar bear is forced to endure the sweltering highs of 40 degrees.

But the directors at the Argentinian zoo remain steadfast in their decision not to have Arturo transferred out of his current situation, claiming the bear is simply suffering the typical ailments of old age, and that relocating him would be too risky as he would need to be sedated.

Zoo director Gustavo Pronotto said Arturo is "close to his caretakers" and that "we just want everyone to stop bothering the bear".

But an environmental group in Mendoza known as OIKOS-Red Ambiental is not giving up, and has said it is working on a report to challenge the decision that Arturo is not able to travel, which was made by a panel of veterinarians on behalf of the zoo in February.

The evaluation was called "unconvincing" by the Ecologists United movement, who claim Arturo was not assessed properly and was only “observed from a distance”.