Some years ago I heard a lot of noise in the chimney breastt..thousands of
flying ants came tumbling out from under the gas fire..they flew straight to
the window which they covered until it looked like black glass..cutting a
very long story short I hoovered them up emptied them into black bags (two
big black bags) threw them into back garden until....
Chap who came down after I reported them said they saw the window and
thought it was the open air where they would mate ...it was a nightmare,I
shudder when I see one now.