Crows Banging On The Windows

Hi, I submitted a question last month asking about what to do to stop the crow or crows attacking its reflection or their reflections in the windows. I decided to make copies of a drawing I did of an eagle and I stuck them on the windows and they have seemed to have done the trick. Does anyone know when the mating/nesting season is over for crows please so I can look to take the drawings down then.