That’s not a fertilized egg. You got turn on wandering for a male and female and when it poops out an egg with a red glow you stick that next to fires or AC’s.
When you get a fertile egg you can use a shit load of fire pits to hatch it I actually did that when the game first launched to hatch my wyverns i used nothing but fire pits
Troll has been used over and over again , but in case you are serious that egg is not fertilized, would be like staring at a jar of sperm waiting for it to grow up