That's part of why it can be so easy to miss an ovi and not be sure a female is going or not if you don't have an ultrasound. You see them building up some, but ovulations don't always last long and if you miss it then all you know is she had been a little thicker, now she's looking pretty normal again. Once you see an ovulation though, that's the point of no return, she has to lay something after that. They'll usually dig in and nest up before laying also, but depending on what cage substrate you use, this may or may not be obvious...and even though they do that, sometime during the 48 or so hours prior to laying, they suddenly do some major cage cruising, doesn't always last long, like they're making one last search around to see if there is another better spot to lay than where they'd been sitting for the last month or so. I'm not sure I see balls do it quite as much as other python species (some boa species will really do it in the last 24 hours prior to birthing...if she's been sitting on the heat and suddenly she's cruising the cage instead of just straight between the heat and water bowl, I try to constantly watch the cage because she may be really about to start delivering babies)...but I do see it some with bp's also. Fun exciting stuff.
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