Fish Crows (Corvus ossifragus) are known to most song birds as a threat. They raid song bird's nests and prey upon their eggs and chicks. A pair of Eastern Bluebirds were keeping a watchful eye on this fellow and dive bombing him if he got too close to their nesting cavity.

I was told by onlookers that the crow had stuck his head into the cavity but came up empty. Apparently the bluebirds built their nest in a deep cavity that narrowed down, preventing the crow from reaching their vulnerable young.

Location: Huntley Meadows Park, Fairfax, Va.