Beachgoers were in shock after two giant basking sharks swam within feet of them at an Irish beach.
What appeared to be an adult and infant, due to the size of their fins, were filmed swimming in the shallow waters of Keem Bay on County Mayo's Achill island.
Despite the species being harmless, onlookers feared they could have been dangerous with a child heard shouting "oh my god".
Alan O'Neill, meanwhile, wrote it was "like a scene from Jaws" when sharing the clip to Twitter.
Basking sharks - which often reach 26ft in adulthood - are second to only the whale shark in terms of size but feed on microscopic plankton.
It is a cosmopolitan migratory species, found in all the world's temperate oceans.
The name comes from its habit of filter feeding on the surface of the water, giving it the appearance of basking.
The Bay was previously home to the world's largest basking shark fishery, with up to 50 sharks a day often caught before trade was ceased over 30 years ago.
In the fishing industry, its flesh and fins are used for food, including soup, and its hide for leather and liver for oil.
In recent years there have, however, been multiple sightings off the UK and the Republic of Ireland, including when one fed in the same spot in Keem Bay each day for a month.
While in April a 16ft basking shark was briefly seen swimming next to a boat in Portloe Bay, Truro, Cornwall.
In the same month, a paddleboarder captured being surrounded by 20ft basking sharks in dramatic pictures taken in Porthcurno, Cornwall.
The video shows the sharks circling around paddleboarder with photographer Michael Amos, 20, saying far from being scared it was a "privilege" for him to get a view of the incredible sea predators.
The marine and natural history photography student, said: "I spent over an hour photographing them in perfect conditions.
"The clear water at Porthcurno allowed me to get great views of them swimming at the surface."
The species doesn't hibernate and is active all-year round, increasing likelihood of being seen, particularly in warmer months as in the winter they generally dive to deeper depths of up to 3,000ft.
It is, however, listed as vulnerable by the IUCN (International Union for Conservation of Nature) list.
Aside from direct catches, by-catches in trawl nets have been one of several threats to basking sharks.
