That summer Pop was having a problem with an overrun pigeon population on the ranch.

In addition, pigeon populations may be reduced by bird control systems that successfully reduce nesting sites.

And as feeders stopped flooding the system with food, Basel's pigeon population waned.

Indeed, such measures often rejuvenate and strengthen the pigeon population.

It's already being practiced in cities across Europe, many of which have witnessed a 50 percent drop in their pigeon populations.

But Ms. Benenson insists that she is only trying to control the park's pigeon population.

In addition, total success cannot be guaranteed and the pigeon population may only be reduced by some 20 per cent.

And doubts were expressed as to its value given the conceded fact that only a small dent was likely to be made in the pigeon population.

Some, and especially the mayor, say it is a badly needed measure to control a growing pigeon population.

Nobody in New York keeps statistics on pigeon population.