TNR programs have been the focus of great criticism concerning the impact of feline predation on wildlife species. The main decline of birds is due to urban sprawl, habitat loss, drought and pesticides, not free-roaming cats. When considering this controversial issue, it is important to understand that free-roaming cats are not the only predators of songbirds. Owls, hawks, falcons, raccoons, squirrels and snakes are predators of songbirds. Birds are killed by other causes, too. Birds are killed by flying into windows, cars, wind turbines, communication towers and high tension lines.