My parents live in the Goldendale area. I have seen a weasel at their place. Weasels are very common and notorious for killing chickens and biting the heads off. This would be my first suspect.
http://www.wildlifenorthamerica.com/Mammal/Long-tailed-Weasel/Mustela/frenata.html
A mink is a possibility in that area I suppose. They are semi-aquatic.
http://www.wildlifenorthamerica.com/Mammal/American-Mink/Mustela/vison.html
And an otter is not impossible in the Wenatchee area although I never heard of them raiding chicken coops before.
http://www.wildlifenorthamerica.com/Mammal/Northern-River-Otter/Lontra/canadensis.html
Whatever the case you need to trap it and kill it. Ask at the local farm store in your area.
http://www.wildlifenorthamerica.com/Mammal/Long-tailed-Weasel/Mustela/frenata.html
A mink is a possibility in that area I suppose. They are semi-aquatic.
http://www.wildlifenorthamerica.com/Mammal/American-Mink/Mustela/vison.html
And an otter is not impossible in the Wenatchee area although I never heard of them raiding chicken coops before.
http://www.wildlifenorthamerica.com/Mammal/Northern-River-Otter/Lontra/canadensis.html
Whatever the case you need to trap it and kill it. Ask at the local farm store in your area.