Ring-necked Parakeets flying in to roost at Wormwood Scrubs park. A total of over 1000 birds roost communally in trees here each night. The parakeets first gather in a pre-roost sites, where they arrive gradually in one and twos. This is a sociable time for the birds, and lots of chattering and squawking can be heard. Once a good number of birds have gathered they then fly in large groups to the main roost site and settle in for the night. Quite a spectacle; both the sight and the sound.