Whistling can also be caused by retained shed in the nostrils or possibly some other restriction of nasal passage that is causing the whistling sound. She definitely would not have survived 2 years with a RI. This risk of breeding your snake I would say is similar to people breeding, there could always be a complication but that is a small minority. I have had snakes lay egg in January all the way to November (had a clutch laid today) so don't think breeding season is isolated to a few months, they go when they are ready. If you girl suddenly stops eating and is not in shed it's very possible she is in her breeding cycle. I watch my girls more than I watch the calendar, they tell me what's going on
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