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At a guess? A change in architecture. Pigeons favor cliff ledges as nesting sites; they'll happily build nests on window ledges as a substitute for natural cliffs. Sparrows favor cavities: tree ...
Answer
At a guess? A change in architecture. Pigeons favor cliff ledges as nesting sites; they'll happily build nests on window ledges as a substitute for natural cliffs. Sparrows favor cavities: tree ...