BigJay:
Keep in mind, not all clutches go to 60 days. Some hatch at day 50, some at day 60 (or anything in between). In my own experience, they will begin to dimple between 2-3 weeks before hatching. I have a clutch that was laid on April 5th that dimpled last week. Doesn't make me worry--it makes me excited, since they are getting close!But as Domepiece said, incubation temp (along with other factors) can determine how quickly they dimple, because higher temps can cause them to hatch faster (but subsequently can cause problems if the temps are too high). I incubate all my clutches at 89.5 degrees F, and they all dimple within 2-3 weeks of hatching.
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