Thanks for sharing.
99% of the time I do not determine a tangled umbilical to be a problem in my unhatched eggs.
This year: At 89 degrees I had a clutch with 8 out of 10 hatch at *68* days. I cut the two non-hatched eggs at day 70 (one pictured below): they had not absorbed the yolk yet and had to remain in the incubator for another 4 days.
If I had cut this clutch at day 60 I'm sure I would have lost at least half of them.
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