A group of cheeky little monkeys escaped from London Zoo by climbing up tall trees and leaping into next-door Regent's Park.
Squirrel monkey Betty leaps for freedom
But their happy antics were watched closely by zoo keepers as they jumped between the park and the zoo.
A spokeswoman said: "They are coming in and out and being a bit cheeky really."
The 12 squirrel monkeys were in trouble earlier this year when they started stealing visitors' mobile phones - and had to be trained to leave them alone.
The monkeys were fond of pinching visitors' mobiles
Zoo bosses said that they were taking steps to stop the monkeys escaping.
A spokeswoman said: "Squirrel monkeys are not a dangerous animal - their enclosure is a walk-through exhibit - and they pose no threat to the public."
The monkeys will return to their enclosure for their food, she added.