Owl Eggs

[waspur]

Why are they spherical ?

[Fibonacci]

From the point of view of efficiency, a spherical egg will maximise volume whilst minimising the amount of expensive shell required. Owls and birds of prey such as Eagles,
Kestrels, Merlins and Peregrines lay �short ovate�
eggs, which are nearly spherical. This shape is fine
for birds which nest in holes or build deep nests, as
the eggs are unlikely to roll out of the nest.

[geo0939]

It also stops the egg exit closing with a snap:-)