Rescuers leapt into action after nine baby swans were washed over the edge of a weir while swimming with their parents.
The cygnets got into difficulties while paddling in a millpond in Nash Mills, Hertfordshire, on Monday.
An onlooker raised the alarm and called charity Swan Support, which is based in Datchet, Berkshire.
Wendy Hermon and husband Steve, who run the charity, came to the rescue.
Mr Hermon clambered in and scooped the chicks up in a net as they struggled against the current.
All nine lives were saved, and the cygnets were soon back with their parents in calmer waters.
“It does happen unfortunately sometimes,” Mrs Hermon said.
“The adult swans know how to stop before the edge of a weir, but the cygnets don’t.”
She added: “Someone who lives nearby called us and we got them out safely and reunited them with their parents.”
Lou Smith, 59, who lives near the millpond, explained how she had called Swan Rescue after watching the cygnets go over the edge.
“They were swimming near the edge of the weir, and the adults were putting their heads under,” she said.
“The cygnets did the same, then they just all got carried away down the weir.
“Mum and dad were just swimming around on the edge – they wouldn’t leave them.
“I called Swan Rescue and they were there in about half-an-hour.
“They got the cygnets out and had to dry individually before putting them back in – they were so cold.”