07-28-2007, 11:36 AM
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To me, the difference you're seeing is just in how fresh (new) the eggs are. They almost look like little white styrofoam balls stuck together when they're first layed, then dry to a pinkish shade, to a whitish almost moldy look before they hatch. The eggs should look the same at first whether they're fertile or not. Conditions just may not have been ideal the first time around.
In this pic, you can see the clutch that's ready to hatch. It looks kind of moldy with dark purple babies inside.