Coo-roo coo-roo  Such a gentle sound but the effect on me was far from gentle. I was diligently working on tomorrow's AtoZChallenge entry, L is for ... when coo-roo coo-roo had me charging out to my patio. As I opened the screen door a flutter of wings confirmed my worst fears. Pigeons were again stealthily plotting to take up residence on my patio.