Baffled Vanessa Keegan, 55, was sitting in the park with her family when she momentarily put her smartphone on the grass to take a photo with her tablet.
But she was horrified when a cheeky seagull swooped down from the skies and grabbed the pink HTC phone and flew off with it in its BEAK.
Workers in the botanical garden ran to her aid with pitchforks in a bid to get the phone back, but the brazen gull flew off and dropped it into a pond.
She is the latest victim of the birds that have already killed pets this summer – with the problem being described as the worst it has ever been.
Shocked Vanessa, from Dublin, said: “The seagull was right beside me and the next thing my daughter Caroline screamed, ‘Mam, he has your phone.’
“Myself and the two men ran after the seagull but he just flew a couple of feet away, veered over the pond and dropped my phone in the middle of the pond.
“The workmen said they’d never seen anything like it in their lives.
“They went back up to their workplace and got waders and pitchforks and went into the water to try and get the phone.
“They tried for ages to get it back but unfortunately they couldn’t find it.
“I just stood there crying and then I started laughing. I lost all my photos, videos of my son in Australia and phone numbers.
“The phone had a pink cover on it so he must have thought it was a piece of meat or something.”
Ms Keegan, from Clonsilla in Dublin, was in the Botanic Gardens with her daughter Caroline and grandchildren, Kai and Jordan, when the gull made its move.
It nabbed her £250 phone and she even managed to get a few photos of the bird bandit using her tablet.
She said both the police and the insurance company had a giggle when she reported the theft, and is now awaiting a replacement phone.
She said: “Even when I rang the insurance company to report it, they asked could I not come up with something better than that.
“I had to fill out a report, and I was even laughing at myself, and when I handed it in to the guard I knew by his eyes when he saw the word seagull he was holding back a snigger.”
In March it was revealed that approximately £250,000 was being set aside by the Government to tackle the ‘seagull menace’.
Earlier this month a Yorkshire Terrier was pecked to death in a garden and a 20-year-old tortoise was killed in another savage attack, both in Cornwall.
This week a pensioner was left covered in blood and a four-year-old nearly lost a finger in similar attacks.