In these days of Photoshop trickery this picture purporting to show a sloth gatecrashing a holiday snap in the jungle looks too good to be true.
But that's exactly what youngsters on an International Student Volunteers expedition in Costa Rica claim happened right in front of their eyes.
In what looks like a scene from Madagascar, the cute critter lowered himself down into the frame as the group smiled for the camera - or at least so swears anthropologist Manuel Ramirez.
The 44-year-old ISV tour guide said: 'There was a big group of us helping cut paths in the jungle.
Star of the show: The sloth pictured with the group shortly after it had reportedly 'photobombed' the group photograph
'I thought it would be nice to take a group shot. As I looked through the camera lens I could see something creeping in to the frame.
'When I realised it was a baby sloth I clicked the button as fast as I could, not that he was going anywhere fast.
'I thought it was too good a picture opportunity and so rather than move I just took the picture with him in it.
Teamwork: Young volunteers from across the world come together for the project to help cut paths in the dense woodland to allow researchers to get around
'It has become a bit of a talking point for everyone. None of us will ever forget the trip, especially when we look back at this picture.
'I'm glad we saw the sloth that day as he made us laugh when we were very tired. Now we can share this moment with all our friends.'
Young volunteers from across the world came together for the project to help cut paths in the dense woodland to allow researchers to get around.
source: dailymail