We normally think of eggshells as being very fragile. However, eggshells are remarkably strong and durable. They provide the embryo with good protection from predators as well as from soil invertebrates and harmful bacteria. The shells of eggs that we eat from the domestic hen are thinner and more fragile than those of its ancestor, the Red Junglefowl. The thinning has occurred because chickens have been bred to produce larger eggs with the same amount of shell material. The resulting egg would not likely survive incubation in the wild.
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