Parakeets group together in 2 chestnut trees next to Mitcham Common, making the the bare trees appear as though they have vibrant green leaves. Croydon, London, January 4 2023. See SWNS story SWLNparakeets. A leafless tree looks alive again after being overrun by parakeets. Images capture thousands of the bright green birds looking just like leaves in two conker trees above a south London BP Garage yesterday. Both trees shed their leaves for winter, but the birds are making them appear green again next to the petrol station and Subway near Mitcham Common on Mitcham Road. Close up, their vibrant red beaks and lurid feathers pack the bare branches in the night.