It's been a good decade for outdoor cats in the nation's capital: veterinary care, community support. But now the local government is proposing to kill them. The plan is laid out in a draft Wildlife Action Plan, put out last month by the District Department of the Environment, that designates feral cats as an "invasive species." There's also a call in the proposed plan for "revisiting" a longstanding program through which the Washington Humane Society -- D.C.'s city shelter -- gives the cats veterinary care, and then returns most of them back to their colonies.