What would only kill and eat one chicken?

Oh no! It sounds like you've had quite the cluck-tastrophe in your coop. Discovering a hen has been taken is never easy, especially when it seems like a mystery predator decided to dine on just one of your feathered friends. From your description, it’s clear that this isn’t the usual fowl play you’ve dealt with before. While raccoons and foxes typically leave more chaos in their wake, the targeted approach hints at a more stealthy predator. A bobcat could indeed be a suspect, as they are known for being both cunning and effective hunters. However, there are other possibilities too, like coyotes or even a determined hawk that might have thought your hen was an easy meal.