Paul Batchelor, deputy mayor of Warminster, said something needed to be done because of "unsightly" pigeon droppings.

BBC: Warminster deputy mayor wants hawk to deter pigeons

We trudged along a dusty shelf, up another metal ladder, and had to crouch to walk through a narrow tunnel, eventually emerging on a concrete ledge smeared with pigeon droppings.

BBC: Subterranean Sydney

The pigeon houses riddling the rock faces, traditionally used to collect the birds' droppings for use as fertiliser, mostly stand empty.

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