Many cities, businesses, and homeowners suffer a similar dilemma. The personable city pigeon often multiplies into a huge population which can tax the resources and patience of local authorities and citizens. The typical solution is often a painful one: cull out the pigeon population to more manageable numbers. It's a difficult decision for any humane group of people to reach. The saddest part is:

COMMON PIGEON CONTROL METHODS DO NOT WORK

Worse than that, the population generally comes back in a short time, possibly within a few months and even stronger than before. The general health, increased habitat, and ability to find food is vastly improved for those remaining after a cull.
For many clients, simple proofing using only the most effective and humane deterrents is sufficient. World-class, free expertise provides the best, cost-effective solution in these cases.

However, a revolutionary non-lethal approach was developed in 1980 by British Pigeon Control Advisory Services (PiCAS) and supported by scientific research conducted in Basel, Switzerland a decade later. Both groups discovered that by simply:
discouraging pigeons from roosting where you don't want them,
controlling food sources,
setting up alternative nesting/feeding sites where eggs are removed regularly
a large pigeon population could be reduced and permanently controlled with minimal expense and effort over time. One successful project after another shows that a pigeon flock can be reduced by 50% or more within 4 years, sometimes considerably less time. Furthermore, this is a permanent reduction unlike the more common culling which must be forever repeated, angering many.
Even better, the whole project can become an economic boon and even tourist draw for the area.

Find out how at: http://www.wingsoverus.org/pigeon/