Eggs of hens and sea birds are in ovoid shape- round at one end and pointy at the other. Ostriches lay eggs that are perfectly round, while pigeons lay eggs that are pointy at both ends. Why the shapes of eggs differ?
The difference in shapes of eggs depends on the number of eggs that birds lay at one time and the type and place of their nests. An egg with an ovoid shape is more comfortable for a bird to lay than, say, one that is shaped in sphere or cylinder. Birds that nest on cliffs, such as seabirds, lay eggs that are smaller at one end than at the other. This makes them roll in a circle and prevent from falling off the cliff. Birds with round eggs, usually build deep nests that keep them from rolling out. In addition, the particular shape of eggs enables more eggs to be packed together for warmth during incubation.
Eggs are incredibly strong, not withstanding their look. Try cracking an egg by squeezing your fingers evenly over it , and you will realize how tough an egg is.
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