As any former fertility patient knows, there is a very measurable spike in basal body temperature during the 24 hours surrounding ovulation. Or at least there is for mammals, I don't know for sure about mites, but the article did say they were measuring temperature among other environmental factors. That would still require the bulk of the female mite population to be on the same cycle, but maybe they have a natural tendency to sync up, like ladies in an office.
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