Why Are Eggs ... Egg-Shaped?

The video explores why eggs are egg-shaped, presenting two main theories. The first theory suggests that the ovoid shape, which is a sphere tapered to a point, helps in the egg-laying process by creating a wedge that is easier to push out. The second theory posits that the shape prevents eggs from rolling away, as they tend to roll in circles, keeping them in the nest. This is particularly beneficial for cliff-dwelling birds, which have more pronounced egg shapes. The evolutionary logic behind egg shapes is thus not circular but ovoid.

What is the significance of the egg's shape in relation to its ability to stay in a nest?

Discuss the difference between circular and ovoid shapes in the context of egg evolution.