I think you're right... I have a bunch of duck in the bator right now that are very much alive and I bet they'll float. Warming up the water as I type, lol.PS THE EGG THAT WAS FIXING TO HATCH ALSO FLOATED , so when i made the statement to float eggs to test if they were good i was wrong cause the almost ready to hatch egg floated also, gonna check some guinea eggs soon to see if they float at the halfway during incubation and will report back, may have to do a daily test in the future if the halfway egg does not float.
-Kathy