A flock of great dusky swifts, also known as waterfall birds, were spotted clinging onto a rocky cliff face behind a roaring water torrent in Argentina.

The footage, filmed on December 2, 2018, shows the small birds who are known for flying through the wall of water to nest and protect themselves from predators.

Nature enthusiast Bob Humphries told Newsflare: “These adult Great Dusky Swifts were clinging to the rock wall of Alvar Nunez Falls in Argentina’s Iguazú National Park, being covered in spray from the roaring torrent nearby, this behaviour protects them from most predators, even if the penalty is to be perpetually wet!”

Great Dusky Swifts (Cypseloides senex) are found in Brazil, Bolivia, Paraguay and tropical northern Argentina in forested and riverine habitats. They are famous with birders for flying through the curtain of falling water, perching and nesting behind the huge cataracts of Iguazú Falls. This behaviour protects them from most predators, even if the penalty is to be perpetually wet! These adult Great Dusky Swifts were clinging to the rock wall of Alvar Nunez Falls in Argentina’s Iguazú National Park, being covered in spray from the roaring torrent nearby. An adult Great Dusky Swift was perched just under a rock overhang that sheltered its nest - there are two chicks in the upper right of the video clip, one of which was fed by its parent.