Snow is actually even better than rain. Any low pressure storm system will get them going ... not just for breeding, but many times for feeding as well.
From talking to some people with backgrounds in biology and animal behavior about this, I have a theory that it has to do with the fact that predators are less likely to "hunt" during storm systems because their sense of sight and smell are limited ... and since breeding and eating are times when ball pythons are most vulnerable, they feel more secure breeding and eating during storms when the predators aren't looking for them. But like I said, it's just a theory.
-adam
Adam, the theory is very interesting and seems grounded in logic, makes a ton of sense to me.... I also try and put my males in just before a storm, but have to put them in the middle and even tail ends of storms and had great results.
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