Egg
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An egg is a reproductive capsule produced by many animals to reproduce. Fertilized eggs contain embryos which develop into whichever animal laid it.Some animals lay eggs which are only visible at a cellular level, like humans for example. Usually the egg contains all the nutrients the developing animal needs, but humans for example just have DNA. Most eggs are considered tasty, such as chicken eggs by humans, but they tend to go bad after a short amount of time unless kept cold.
Birth Egg
Jenny Swan's birth egg can be seen at the London Museum of Natural History.