A friend of mine made her thesis on the stray cats of DC!
This short documentary examines the effects of feral cat overpopulation on the local community of Washington, D.C. Growing numbers of homeless cats nationwide have led to the existence of outdoor cat colonies, many of which are fed by area residents. Over 300 feral colonies are monitored by the Washington Humane Society in the District of Columbia alone. Feral catsí excellent hunting abilities have put pressure on native and migratory bird populations, and their exponential reproduction has overwhelmed local adoption centers. The efficiency of current Trap-Neuter-Release (TNR) programs, which aim to sterilize the cats, has been debated as a viable method of curbing population growth.
Many drastically different solutions have been proposed, though all parties agree on one idea- feral cats should not exist. Whether we choose to protect or eliminate these animals humanely, it is first the responsibility of the pet owner to have cats spayed/neutered and kept indoors.
See the film.