Here's a thought about deep nesting. It's highly probable that the only reason the eggs are all nice and piled up is because they have significant less space in which to lay them. They borrow down and make a small nesting chamber that is nice and cozy. So the eggs can't "roll" around or get aborted or whatever lame phrase FR wants to use. Now with shallow nesting like in the actual tubs that FR uses (not the ones he just pushes on everyone) they have more room to spread out and the eggs have a higher chance of simply rolling off the pile. I can see how this can give the false impression that they either happier in the deep or unhappy in the shallow.

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