A distressed killer whale has been filmed banging her head against a tank at an enclosure after outliving her five babies. The heart-breaking footage was taken by anti-captivity activists at MarineLand, Niagara Falls earlier this month and shared on social media. 'Anti-captivity activists entered MarineLand and observed Kiska, their last surviving orca bashing her head against the wall. ... The 44-year-old orca was born off the coast of Iceland and has been in captivity since 1979, according to Demers. She has spent the last 10 years alone after outliving her tank mates, including her five offspring....