There were surely a few million of these birds and as they gathered for the night a large part of the city stung of fresh bird dropping.
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Sadly because of my position while this was happening I didn't manage to get any decent snaps of them in cloud formations. What a sight that was! Check out a you tube video that someone has posted about the same from Rome - http://www.youtube.com/watch?v=YadP3w7vkJAThe only other bird that I managed to watch for a while was the Hooded crow (Corvus cornix)
Snapped above walking in the ancient Roman forum.