I have a theory

I'll be interested to see if this works out...it's an interesting theory!

 

Well, this particular theory would be fairly simple to test out if you got one of those personal weather stations with the wireless remote sensor and stuck the sensor in the nest. It will tell you the temperature, humidity, and various other readings at set intervals, usually hourly. The better models even now have a USB port and software so you can download the data. Might be an interesting experiment if you wanted to go that far. I guess a simpler, cheaper way would be just stick a thermometer out there and go read it every once in a while while the bird is off the nest.

 

I noticed too that my broody duck spent a LOT more time off the nest when it was really hot outside than she did on cooler days. Like she knew it was warm enough that the eggs were okay. OR, because it was too hot and uncomfortable for her on top of those eggs, and she wanted to lounge in the pool instead!

Anyways, even though she spent entire DAYS off the eggs when it was over 90 degrees and humid out, 7 ducklings hatched. It didn't matter that she spent 12 hours or more at a time off the nest. She was probably only actually ON the nest for about 75% of the incubation process. So I think you're right.

 

I've noticed that wild birds (not just ducks) don't sit on the eggs so much if the temp is hot. Sometimes, they will even stand and shade the eggs if they're ground nesters.

 

I think it may be ok. They were insulated so it takes a while for the core temperature and even humidity to go down into dangerous. I would be concerned if she continues not to sit on it, because that can indicate that there is something wrong with the eggs itself.

 

Those mommas know what they're doing...

 

Sounds good to me.

 

My Muscovy spent vast amounts of time off the nest when it was 100+ outside and still hatched 7 out of 9. They know what they are doing.