Repeated alarm calls from an American Robin drew my attention to another bird on the roof. Thinking that the Robin was upset at a small raptor, I quickly grabbed my camera. Much to my surprise, the Robin had his knickers in a knot over a Rock Pigeon. I am fairly certain that this Pigeon posed no threat to the Robin nest and nestlings.
(Photographed August 5, 2019 on private property, Emily Township, City of Kawartha Lakes, Ontario, Canada)