The don't lay inverted during ovulation. They do however lay inverted during their pre-lay period, it's called inverted basking and they do it to cook the eggs evenly. Some will do it during summer months also(not being gravid). Although, I have observed my females doing this on the cool side after being paired with males for a couple months. I believe they were cooling themselves thoroughly. At the time I was not using a night drop and they probably needed to cool just a bit more than they were already.
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