Double-shelled egg. Egg within another egg. This is a rare occurrence. The mechanisms by which double-shelled eggs are formed are not understood.

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Photo credit: © PASCAL GOETGHELUCK/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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Keywords: -life, biological, biology, double, double-shelled, egg, fauna, food, foods, foodstuff, foodstuffs, life, nature, rare, shell, shelled, shells, unusual, yolk, zoological, zoology