Not seen one of these before

At NT Hidcote again this afternoon when I came upon this. Never seen a pigeon on a nest before. This nest was situated in the rafters of a conservatory.

Went to Macbeth last night. Expected more horror than was delivered and the importance of Birnam Woods did not come across. The attacking army did not appear to have used branches to camouflage themselves and did not convey the movement of trees.