Many empty eggs, and what about the black ones?
It's been a bad year for butterflies - last year I raised over 60 black swallowtails. This year I have had less than a dozen. Yesterday I found a dozen or so new eggs on my rue, very happy about that. However I found at least a dozen or more "empty" eggs...perfectly shaped but clear with nothing inside. I read here before that the butterflies don't know they aren't viable, just laying anyway.
This year I have gotten a number of black eggs too. At first I thought they were previously overlooked, and ready to hatch. But nothing ever happened. Then I realized they were way too black...swallowtail eggs don't get that dark before hatching. Anyone have the same thing or know what's going on?