There is not two breeding season from what ive seen. The reason people say that is because in the captive reproductive husbandry of pythons and boas book they plot the observed copulations as a function of months in one year and there seems to be two distinct clusters. However, I saw copulation every single month of 2004 but got no eggs that year. the inverting posture is also not very informative as mine will invert within 24 hrs of a steep cold drop followed by a heat spike. Also, my female that laid eggs in 2005 didnt even invert when she was gravid, not even once from my observations. The best indication of whether your on the right track is to feel for follicle development, which should occur very early in the season (which you determine by temp /humidity cycles). The females SEEM to have to be at least 6-8 years old in order to have this development, although i saw copulation at year 6 and could have sworn there was initiat follicle development, which arrested early. The male on the other hand, could probably be alot younger. Pay careful attention to youre own snakes, because in papuans i have seen some funky differences in individual behavior (out of the 6 papuans ive owned), so the jury is still out for fun facts about these guys. Good luck, it sounds like you have the obsession/passion that these guys deserve.
-d

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