elk

Neal Herbert / National Park Service

Critics of wolf reintroduction in the Mountain West say the canine is the biggest threat to elk, but a new study says that’s not necessarily true.

Chronic wasting disease is crippling deer populations in the Mountain West, around the country and in bordering Canadian provinces. It's not a bacterium or a virus or even a fungus, but caused by something called a prion, a type of protein that all mammals have in their bodies.