pigeonsUnsure of how to control a tourist boom that has prompted street protests, Barcelona has at least come up with a way to stop an invasion of the feathered variety: by putting pigeons on the Pill.

Experts estimate that there are 85,000 pigeons in the city and they blame the birds for spreading illnesses and covering people in excrement.

Now authorities plan to introduce the contraceptive nicarbazine, which does not harm the birds’ health, in 40 feeding tanks. It is hoped that the population will fall by 20 per cent in the first year and 70 per cent within four years.

Ada Colau, the left-wing mayoress of Barcelona, has opted for an “ethical” solution. In the past council workers captured pigeons in nets and killed…