Why egg is oval in shape?

Answer 1

Eggs didnot have the shell when it was inside the body of the hen hence shapeless. To lay it the egg has to pass through an elastic tube having a peristalsis wave which propels it out wards. when it meets the anal sphincter more pressure is required to push it out thereafter as the egg passes out and with the contraction of the sphincter the later part of the egg get taperred off gradually thus it becomes oval. As it passes through the elastic tube it acquires its shell and finally becomes hard with the exposure to atmosphere. This explains its oval shape.

Answer 2

Actually, it is not oval but has a pointy end, a little like a cone.

The reason for this is that the eggs will roll in a circle, and not in a straight line. That way the eggs will not fall out of the nest. This is especially important for seagulls that lay their eggs directly on a cliffs edge.

Turtles have perfectly round eggs, since they bury them in the sand anyway.

The round shape gives the greatest volume compared to its surface area.