Chronic wasting disease is a rare neurological disease that is fatal to deer and elk. It belongs to a family of diseases known as transmissible spongiform encephalopathies or prion diseases. The disease attacks the brains of infected deer and elk, causing the animals to become emaciated, display abnormal behavior, lose bodily functions and die. CWD hasn't been found in any of Montana's wild deer or elk. Visit FWP's CWD web pages at http://www.fwp.state.mt.us/hunting/cwd.asp for more information.