The place I work at has had a large pigeon problem for quite a while. A couple of months ago, they called in a team of guys to catch them, then release them 100 miles away - then put a sticky substance on the shelving that the birds would not like to land on, thus moving away.
One very large pigeon alluded them.
Weeks went by. Apparently, this particular large pigeon is the Pied-Piper of pigeons, as about a dozen and a half more had again populated the store shelving. An employee contacted the EPA, saying the birds were a health hazard (which they are). The EPA informed the store the birds were to be dealt with immediately.
Another team came in to clean out the pigeons. And once again, one eluded them - the granddaddy of them all. This time, the team installed a misting machine which emits a sour grape smell, which apparently pigeons hate with a passion.
This fucker came back and has perched nightly on a skid right over the mister. I mean, literally, right over it.
This bird is the Albert Einstein of the pigeon world. I am betting that every night, this fucker is breaking into the store and creating a weapon of mass destruction out of tools from the hardware department.