Ornithologists now agree that there is a very good reason why birds' eggs are generally narrower at one end than the other. What is the reason?

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A spherical or oval egg would roll in a straight line. How-ever, an asymmetrical egg, which is narrower at one end than the other, will tend to roll in a circle. (Try it with a normal hen's egg.) if the eggs are on a cliff edge or other precarious place, the tendency to roll around rather than straight is a distinct advantage.
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