A group of swimmers have filmed the terrifying moment a venomous snake glided through the water towards them – and it happened in the UK.
John Meirion Griffith, who filmed the uncommon scene at an Angelsey beach near Rhosneigr, was out water skiing with his friends when they spotted an adder weaving its way in the sea towards Traeth Cymyran.
In footage posted on his Facebook on Sunday (June 16), the vibrant-coloured serpent is seen eerily "floating" on water.
As John approaches closer, it becomes clear that the adder is swimming on the water surface in a zigzag pattern.
John and his friends are shocked by the sight and can be heard commenting: "Seriously what's that? That's mental!
"Look at that, it's a f***ing adder!"
The adder finally reaches the shore and slithers its way up a rock before disappearing in the dry land.
Adders are the only venomous snakes native to the UK, but the group were still shocked to see one swimming across sea.
John told Daily Post: "We knew there are plenty of adders in the Cymyran area, but never in our lives had we seen one swimming across the sea like that!
"I didn't realise until I got home and googled it that it's a pretty rare thing to witness."
Dr. Wolfgang Wüster, a herpetologist at Bangor University, watched the clip and agreed that the scenes are "uncommon".
He said: "Adders in the sea are an uncommon sight, but not exceptional – there are various records of adders on beaches or even in the strandline in north-west Wales.
"Elsewhere, they have also been documented in the sea – in Swedish studies in the Baltic, adders have been recorded moving between small islands hundreds of metres apart in the sea."
According to the Woodland Trust, adders are considered shy creatures that will naturally retreat from humans.
"It is rare for adders to bite people, but this can happen if humans try to handle them or accidentally step on them," the website stated.
"Adder bites are rarely fatal, but can be very painful."
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