I know what you mean by the double u bend tunnel....I'd call it a torturous path.
Like a tight s-curve...too tight for a foxes longer body to navigate.....interesting idea,
but I think foxes are that flexible, they're pretty skinny and not that long.
I still doubt you could get a chicken to use a tunnel, but I'm imagining you would need to use an 8" or 10" PVC for a chicken to be able to potentially navigate? An S curve in 8" or 10" pipe isn't exactly all that tight for an animal that sleeps like this and has a body that is only about 4.5" wide (less fur)...
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