the world's saddest animal

This is Arturo, a polar bear living in South America who has been called the ‘world’s saddest animal’.
He sits in a concrete enclosure at Mendoza Zoo in Argentina in temperatures of up to 40C (104F) and is said to have been depressed since his long-term friend Pelusa died two years ago.
It is claimed the 29-year-old’s lonely life is causing him to display abnormal behaviour, including tilting his head and showing his teeth while pacing back and forth and rocking from side to side.
Arturo - Spanish for Arthur - has been at the zoo for two decades, and has had no contact with his own kind since Pelusa died. Now, campaigners are worried that he is suffering mental health issues.
US singer Cher, 68, said on Twitter: ‘Don’t cry for him, Argentina? No tears of Mrs Cristina Fernandez de Kirchner for tortured polar bear Arturo. Your hands are stained with his blood when he dies.’
Animal rights activists now want Arturo - whose only access to cooling water in his enclosure is said to be a pool just 20in (50cm) deep - moved to another zoo that offers cooler conditions.
Mendoza Zoo blocked an effort five months ago to move Assiniboine Park Zoo in Winnipeg, Canada - where a new International Polar Bear Conservation Centre is located, reported the Sunday People.
The zoo did not believe the bear would survive the two-day trip, with director Gustavo Pronotto saying the medical board had made a decision - and officials were keen to ‘avoid a big mistake’.