Why are bridges always surrounded by pigeons?

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Why are bridges always surrounded by pigeons?

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Bridges often contain many convenient ledges where birds can rest without worrying about being attacked by ground-based predators. Such structures tend to attract birds compared to other places.

Pigeons are “rock doves”. They naturally nest on rock outcroppings and cliff faces. In a city the structural edifices of the buildings and bridges make for a near perfect replication of their natural nesting places.

What do pigeons eat? I figure bugs. In that case, Bridges offer nesting locations above water that attracts insects.