Hot and muggy today. At one point this morning counted 11 swifts screaming round the house. It was wonderful. Not seen so many for ages. 4 clips tonight. 2 from each nest. The chicks are almost the same size as the adults. They are now moving about outside the nest. First 2 clips from the chimney nest showing one or two chicks outside the nest. The third shows how far they get from the nest and finally an adult being bombed.