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Their lack of wariness has earned the birds the dubious nickname “fool hen,” as they often stand or walk only a short distance when spooked and fly up into a nearby tree to observe.

I guess that's why it's called the fool hen, though its proper name is the willow grouse.

This is another of the grouse family that has been given the name of "fool hen," on account of its naturally tame nature.

It is naturally a confiding bird where it has not been hunted much, and for this reason has been given the name, "fool hen," in many localities.

While we were unloading the horses, a "fool hen" came and lit in a tree near us.