You're right... I was pottering around the garden this afternoon and found my pair of blue ones peeting in the pittisporum. The pigeon nest resembles nothing more than a pile of badly arranged twigs and could never hold an egg, let alone an active youngster, so it may just be a 'resting' nest... sort of TraveLodge for pigeons... although it looks more like the Bates Motel sort of thing!

LTS