Many german cities  have adopted neutering programes to control the cat overpopulation .

The origin of stray cats comes especially from free roaming un-neutered cats, particularly those living in farms. Since cats are already sexually mature at four to five months and can raise two litters with at least three kittens, the situation steadily worsened. Bremen, Hildesheim, Paderborn amongst others have already recognized the problem and responded by adopting a cat protection regulation including CNR/TNR programes and compulsory neutering for cats. (german)

Four Paws- Vier Pfoten
Four Paws-Vier Pfoten