not on purpose!! i tried candling some pheasant eggs. day 6 could not see any thing!!! but one of the eggs i picked up was cracked pretty bad so i thought it was junk. IT WAS NOT!!! very hard to brake in to. and it had its veins and you could even see it heart beat! i was a little sad that i killed it but it was very cool to see!! this is the fist eggs i have tried to hatch and they are growing!!