Crows are the one of the worst birds. Theres a load of them that sit in trees around my house and they also sit on the chimney pots of the house next door. They make that awful noise. One time there was this one bird who was sitting on the chimney pot and was squarking for an hour or more and I couldnt take in any longer. I got the air rifle in my house and he wasnt squarking anymore. I felt kind of bad but there is a lot less squarking now.