Pigeon shelter employee Andreas Kappelmann spreads pigeon food in one of the three public pigeon houses in Frankfurt. If he finds eggs in the nests, he exchanges them with dummies which the pigeons will keep breeding. Three dens have been built in Frankfurt. The 'Stadttaubenprojekt' fights for more. The authorities do not want to build a higher number. It thinks that the dens are ineffective since they are populated by too many pigeons. Reason does not apply when it comes to pigeons in Frankfurt and in most parts of the world.