I forwarded the article to the Animal Welfare Commission of Tulsa, which will soon be providing a recommendation about the TNR issue to the city council. Like other invasive species, animal and plant, cats need to be controlled to help protect and restore regional biodiversity, improve ecosystems and maintain public health. Most cat owners in the U.K. allow their cats to go outdoors, and oppose the idea of keeping them indoors to protect wildlife, says lead author Sarah Crowley. (Send all mail to firstname.lastname@example.org or to Dr. Michael Fox in care of Andrews McMeel Syndication, 1130 Walnut St., Kansas City, MO 64106. The volume of mail received prohibits personal replies, but questions and comments of general interest will be discussed in future columns.