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Ok thanks. My zebras haven't played a fertile egg in a while, I hope this is fertile. And even when they did they always tossed it out of the nest...

So, my zebras layed an egg. And I incubated it probably one week or so. Now, I candled it, but instead of seeing a heart or veins, I see small circles. I place the egg right on the flashlight, and the circles move themselves! What are these and is the egg fertile?