Found it
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They all look like Janeka's. Given that she is 6, how long do you suppose it has taken her to lay this 15, and how likely are the oldest to hatch? How many might be fertile?
When hens choose to make a secret nest rather than lay in the coop, do they plan to brood? I know Shad has long maintained this, but I've not seen or read any arguments or evidence for it.
If the answer to the planning question is 'yes', do they know when to stop laying and start sitting? Which amounts to, do they know when the oldest eggs are reaching borderline viability? I think they can and do expel from the nest any egg they think is dodgy, which implies that they also have some sense that there's nothing wrong with an egg too, though being old or infertile doesn't obviously give out signals like a rotten egg would.
A propos which, I found a nest of Janeka's a year or two back that she abandoned after one egg broke (apparently a defective shell) and contaminated some but not all the others. Evidently she decided it was not worth carrying on in that case.
I think I am sufficiently interested in these questions to let her carry on, and watch what happens, and then deal with the consequences, if there are any, when they arise.
I really do not expect to see another 15 chicks in due course, and it'll be a forced sale if it happens. Though imagine how much inbuilt immunity a chick of a 6 year old would have!