Last year was very poor for our House Martins. The mud wouldn't stick properly to the brick and the nests kept falling down. This year I was determined it was going to be different. In April we put up three artificial nests and the Martins took to two of them. We now have four chicks who should be ready to go in a week or so. I'm impressed with how industrious they are, they seem to bring in food every couple of minutes from dawn until dusk. Wonderful birds!