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Photos of Eggs at Various Stages of Development

1. An Infertile Blue Cap Egg

2. Fertile Orange Cheek Egg from an Abandoned Nest

3. Orange Cheek Egg Close to Hatching in Same Abandoned Nest

4. Embryo Inside the Egg Pictured in (3).

Note that the parent orange-cheeked waxbills hatched one chick from this same nest, tossed it, and tossed it again when I put it back in the nest. The next day, they tossed an egg that was near hatching (similar to 3), then abandoned the nest altogether. I do not know why there were eggs at various stages of development in the nest at the same time.