I've heard this theory, and I've heard even more times that it is false. I incubate at 88-89deg, and have only had one bee out of 12 spider combos in the last two years show any wobble. The other 2 in his clutch show zero wobble. That probably isn't a big enough sample size to form my own definitive opinion on the matter, but for now I intend to continue incubating exactly as I have. I struggle with believing that a 2% temperature change can really make that big of a difference.
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