Campaigners living next to Feltham Marshalling Yards nature reserve are hoping information uncovered about the diversity of wildlife on the site will save it from being transformed into an industrial train depot.
The decision by BAA to earmark the former Feltham Marshalling Yards for development has prompted furious residents compile a detailed species record of some of the rare creatures there.
So far they have uncovered a staggering 132 species of birds nesting there, including Green Woodpeckers, Linnets, Skylarks and White throats. There are also Goldfinches, Gold Crests and rare water fowl.
BAA want to return the site to its previous function as a train depot to service a new fleet of 'Airtrack' trains running in and out of Heathrow Airport.
Doctor's receptionist Marianne Lippiatt, of Durham Road, is campaigning against the 'Airtrack' proposals, which would spell the end for the thriving Nature Conservation Area which developed after the original marshalling yard closed in 1969.
She said: "Anyone living in this area knows the nature reserve is packed full of different birds and animals, including adders, water voles and rare butterflies.
"I think it's unforgivable that they're even considering building on a nature reserve - no one around here wants to lose this beautiful green space."
Over 200 residents have already signed a paper petition opposing the plans and protesters have now set up an online petition on the Number 10 website. To add your name visit http://petitions.number10.gov.uk/Airtrack-Depot/ before June 2.