A disturbing video has come to light showing tourists in San Bernardo, Argentina, killing a "vulnerable" baby dolphin in order to get selfies with it.

The tourists dragged the tiny mammal out of the water on Sunday, Argentine newspaper La Capital reported.

A witness told Argentinian news station CN5 the tourists "let him die".

"He was young and came to the shore. They could have returned him to the water - in fact, he was breathing. But everyone started taking photos and touching him. They said he was already dead," she said.