eggs feel hot. normal

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I am on day 15 almost 16, i removed the infertile eggs today and notice the developing eggs feel warmer than normal. is this normal? are they just providing their own heat? my temp is at 100 right now and i am using a hava bator 1602-n with a PC fan, and there are 6 eggs in it.

 

[202roosterlane]

Mine seem to as well but if your sure about the temp, double check the humidity so it does not drop to low. Providing you are not doing a dry hatch.