"oology : (ornithology) The study of birds’ eggs. The hobby or practice of collecting..."

“oology : (ornithology) The study of birds’ eggs.
The hobby or practice of collecting birds’ eggs, especially those of wild birds.
Today, the second Friday in October in 2019, is marked as World Egg Day by the International Egg Commission, an organization representing the egg industry.”

- https://en.wiktionary.org/wiki/oology#English

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