A petition demanding that a polar bear be moved to Canada has gained over 200,000 signatures, and support for the effort only continues to grow.

Arturo, a 29-year-old bear at Argentina's Mendoza Zoo, has been dubbed the "world's saddest animal" by some media outlets. Experts say he fell into depression after a companion died in 2012, The New York Daily News reported.

The bear lives in a climate that can reach over 35 degrees Celsius. One of the only ways he can keep cool is in a pool that is just 50 centimetres deep, according to The Daily Mirror.

The campaign to move the bear, which has persisted since at least 2013, has gained new energy recently with a Change.org petition.

It calls on Argentina's President Cristina Fernandez de Kirchner to push for the animal to be moved to Winnipeg's Assiniboine Park Zoo, which hosts an International Polar Bear Conservation Centre.

The petition has gained some high-profile support. Former U.S. House of Representatives speaker Newt Gingrich urged people to sign it in an Instagram video posted Wednesday.