Feral Pigeons are killed, often leaving their young in the nest to die of starvation and dehydration, because some people regard them as a nuisance.
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http://www.pigeonprotectionandrescue.com/freeingtrappedpigeons.htm
PIGEONS TRAPPED IN NETS AND BUILDINGS
Every year in the UK pigeons are trapped behind the netting that is put up to deter them and die a lingering death by starvation or strangulation.