A man who built a raft to save a swan's nest of eggs said he was "over the moon" to watch her become a mother for the first time.
Rob Adamson said he had kept an eye on the swan for 10 years in St Ives, Cambridgeshire, and had seen her eggs destroyed by floods and foxes.
He built a raft at Jones Boatyard, where he lives and works, to save the nest as water levels rose last Friday.
All eight of the baby cygnets had since hatched, he said.
Mr Adamson said she had previously been "the unluckiest swan" and he was "determined" to make sure her babies survived this time.
"I have been pacing around the marina like an expectant dad for the last week," he said.
"When I saw them start to hatch I was so happy, I was bouncing around like a kid at Christmas. It's like winning the lottery."
Mr Adamson, 42, who lives on a narrowboat at the boatyard off the River Great Ouse, built a fence to keep foxes out and made the raft in the dark when he noticed the water was lapping around the swan's nest.
He said: "You're not supposed to interfere, but it had got to the point where they were all going to die.
"I couldn't go to bed knowing that. I knew I would regret it if I didn't do anything to save them."
Mr Adamson, known locally as "the swan man", previously raised an abandoned cygnet called Sid and tried to release him into the wild, but he kept coming back.
"After Sid, I've got a special place in my heart for swans and I have been watching this pair fail for the last 10 years," he said.
"This is why I am here, living on the water. I'm in dreamland with all the wildlife. I wouldn't swap my boat for a £10m house."