From Daily Mail (caution: tabloid):
This is the moment eerie-looking black shapes appear to slither across the sky over east London leaving a grandmother ‘speechless’.
Marie Noel, 59, was at her home in Walthamstow, East London on December 26 when she heard birds squawk, something which she said was unusual. ‘The birds were making a lot of noises. I feed the birds and know they don’t normally make these sorts of noises at two o’clock in the morning. They’re normally asleep,’ she told MailOnline.