A great tit has made its home in an ashtray outside a tool-making company in Birmingham.
The ashtray is now off-limits to smokers
Smokers at Guhring in Castle Bromwich found the bird, which has five eggs, nestling among the cigarette ends.
The box, which hangs on a wall outside the firm, is now off-limits until the great tit leaves.
Managing director Mike Dinsdale said: "It's pure luck (the smokers) didn't set fire to the nest in there with all that bedding."
Mr Dinsdale continued: "It's unbelievable really, when you think of all the places it could have nested.
"The holes for butts on the box are the same size as on a bird box so I suppose it seemed the natural place to nest."