This hen is feeling the nesting instinct. The evil giant featherless monster (me) has been daily removing her eggs and the eggs that her friends kindly lay for her, much to her frustration.
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One of the reasons that we all have eggs year around and they don't cost $1 per egg is that over the years, breeders have bred the nesting instinct out of most chickens. Hens naturally lay less when they are molting, in very cold or very hot weather, or when daylight hours decrease, and not all when they become broody or for several weeks afterward. Unnatural conditions of egg factories and breeding out certain characteristics solve most of those problems.

When we first got chickens, I had visions of magnanimously giving out farm-fresh organic eggs to friends and family. Nothing could be further from the truth. Despite feeding 18 chickens, we are still buying eggs!
To be fair, right now most of the chickens haven't reached the egg laying stage so we should see some improvement. But invariably, we have had one, two, or three hens (of four or five) in the broody stage and the others laying their eggs in precarious spots where the dogs can find them.

Update: a week after I first wrote this, the hen is still sitting on the rocks.