Extended Laying Interval of Ultimate Eggs of the Eastern Bluebird

The question is: how does a bird "know" when to stop laying? When is enough enough? When is the clutch (all of the eggs laid in one breeding attempt) complete? Most of ecological literature is focused on energetics: are birds getting hungry, have they depleted some important source of energy, etc.

But the circadian field looks for internal mechanisms.

This paper is by Bora! (and co-authors)
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