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Female sydians do not have an established breeding season and ovulate multiple times throughout the year. Roughly every 240 days and lasting up to 30 days, regardless of estrous phase, female sydians begin to crave the oxidizing enzyme of other sydians; male-female interactions during this state almost always result in intercourse. This heat-like state is indicated by the head hair becoming fiery orange and the affected female seeking out other sydians more diligently. While males prefer females in the receptive state, they are not above seducing non-receptive females or employing physical force to breed.