Photos can be taken of birds around Tube stations. Pic by James Offer
London Underground (LU) passengers are being urged to help log London's bird population by entering a photographic competition.
Entrants are asked to photograph wild birds within a five-minute walk of a Tube station for a chance to win a prize in the Mind the Bird contest.
The contest is being launched by LU and the Royal Society for the Protection of Birds (RSPB).
In the past five years, 42 bird species have been spotted on LU property.
Tim Webb, from RSPB London, said: "We all rush around in our daily lives, rarely taking time to pause and admire what's going on in the wider world. Here's the ideal excuse to lift your eyes and discover the wildlife that lives alongside us."
The competition is open from 2 April until 31 May and the pictures will be judged on relevance and originality.
Marian Kelly, London Underground's Environment Manager, said: "The Tube provides easy access to hundreds of green spaces across London although it's clear that you don't have to stray far from the transport network to discover a huge variety of bird life."
The judging panel includes birdwatcher David Lindo and the winners will be announced in July.
Prizes include an annual pass to RSPB reserves and a family pass to the London Transport Museum, as well as bird feeders and books.