Given my love of churches and birds you won't be surprised to find me interested in this story.
Hundreds of Rose-Ringed Parakeets have attacked a church spire in South London. The spire is made of shingles and the birds have started pecking at the shingles.
John Tayleur (British Trust for Ornithologists) has suggested using noise and a bird of prey to scare the parakeets. He said he was surprised they were chewing shingles but they often ate mortar for the minerals it contains and because the grit helps them digest food.