A grandmother has raised environmental concerns as the children's craze for rock-painting grips the UK.
Dozens of rock painting groups have sprung up across Cambridgeshire as a way for communities and families to come together by decorating rocks and pebbles for others to find.
The craze has mushroomed, from just a handful of youngsters in Ely to people of all ages leaving them across Cambridgeshire and in the cities and towns across the UK.
It is seen as a wholesome pastime for children, encouraging them away from computer screens to spend time in the fresh air collecting stones to decorate.
But now a Bristol-based granny has hit out at some of the plastic stick-on decorations used to make the rock creations, from shiny gems to foam shapes and googly eyes.
Posting on the Bristol Rocks page, which has more than 25,000 members, she said: "As a wildlife rehabber I and other small local rescues are beginning to get small birds, hedgehogs and rodents coming in after eating plastic 'googly eyes' and shiny gems and bits of foam shapes and stickers stuck to their bodies, which we believe are coming from painted rocks.
"Certainly it is not something I have encountered before and I have been doing rescue rehab for many years.
"My grandchildren and I love to paint and hide rocks as much as anyone but when you see the result of a small bird that has chocked to death on a 'googly eye' fed to it by the parent bird that thought it was food, it is extremely distressing."
'Rockers' are asked to paint their rocks, take a photo of them, post it on the Facebook group, before hiding them somewhere public such as a park bench, or under a tree.
Anyone who finds one of these creations is encouraged to let the group know by posting a photo – and many hide them again for others to find.
The hobby has exploded in popularity in recent years with groups popping up as far afield as Australia.
The 'Love on the rocks UK' Facebook group boasts more than 30,000 members.