‘A lightweight enemy could have helped speed up rusting on the collapsed Minneapolis bridge: pigeons.
Experts say corrosive pigeon droppings caked on the bridge could have made steel beams rust faster. Investigators still haven’t pinpointed what caused the collapse, and haven’t said whether the birds had a part in the disaster that killed at least 13 people.
But inspectors in a late 1980s report noted a “coating of pigeon dung” on the bridge. Pigeons have long been a structural pest, because their dung can eat through concrete.’
Followup to Divers suspend Minneapolis search.