A fifth egg for lil Mom and Dad. Thought so. They went on mating. The female starts refusing the male to copulate with her when she knows the last egg is on it's way. Androgens drop and prolactine/progesteron levels start to rise. So she is not in the mood anymore, she wants to breed. In the male the prolactine levels start rising by seeing the eggs. That's why he so attached to the eggs, that's why he comes in the nestbox and starts eechipping when he sees the eggs. It is all hormones that are influencing their behaviour.
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