Heart-breaking footage shows lonely orca staring at tank gate for 24 hours straight

Heart-breaking footage shows a captive killer whale laying almost motionless in a tiny pool at Mundo Marino, Argentina's largest aquarium.

Kshamenk, 35, was first brought to Mundo Marino in 1992 after being captured off the Samborombón Bay.

According to Mundo Marino, the then three-year-old orca was found beached on the bay by three fishermen along with three other killer whales.

Kshamenk was then taken to his concrete tank at the aquarium, where he has spent the last 32 years.

Kshamenk's tankmate Belen died in 2000, at the young age of 13, which means he has spent the last 24 years in total isolation from his own species.