A killer whale thrashes around and circles its tank after outliving all of its offspring and friends in harrowing footage.
Dubbed the 'world's loneliest orca', Kiska is shown circling the perimeter of her tank and splashing water over the edge at MarineLand Park in Niagra Falls, Ontario, Canada.
Kiska, around 45-years-old, is believed to have been captured in the waters off Iceland in 1979.
Orcas are intelligent and social creatures and activist and former employee of MarineLand Phil Demers, 44, said "her mental and physical health are deteriorating"
He said: "Kiska is MarineLand’s last surviving orca. She was captured in 1979 in Icelandic waters and has been at MarineLand ever since.
"She repeatedly swims around her pool in the exact same way, even stopping briefly in some shallow water to shake erratically.
"Experts call it 'zoochosis'. Orcas are social animals and need to be with their families, or in the least with others of their own species."
Paul even went as far as describing Kiska's existence as "torture" and that she does not appear to have much of a future either.
"For Kiska, her isolation is torture. Sadly, Kiska’s fate is largely sealed at MarineLand as she is their property, and as no viable seaside sanctuaries exist, her future is heartbreakingly bleak."
Orcas can live up to 80 years old in the wild, but the longest any has survived after being born in captivity is SeaWorld Orlando's Kayla, just 30 when she died.
Experts claim orcas are simply not designed to live in captivity, travelling distances of 40 miles a day in the wild.
Others argue it is up to keepers to provide them with enough mental and physical stimulation.
Marine mammal scientist at the Animal Welfare Institute, Naomi Rose told National Geographic: "You have evolved to move great distances to look for food and mates then you are adapted to that type of movement, whether you’re a polar bear or an elephant or an orca.
"You put [orcas] in a box that is 150 feet long by 90 feet wide by 30 feet deep and you’re basically turning them into a couch potato."
Whistleblower Phil came out against his former employers, naming his campaign 'SaveSmooshi' after a walrus named Smooshi in captivity at the park.
MarineLand sued Phil to the tune of £1.2 million for supposedly plotting to steal Smooshi.
Phil said: "I left MarineLand in 2012 because of ongoing issues that were grossly affecting the animals’ well-being and was being ignored for too long.
"It’s no mistake MarineLand has made me jump through impossibly expensive legal hurdles throughout the last decade.
"I’m just here fighting for a happy ending. My mission only ends once Smooshi and I are reunited."
