What caused this pinhole?

What caused this pinhole?

Ask yourself the following questions:  What do I see?   What does it mean?   What should I do?

This is Practical guide to improving egg quality

• LOOK: There is a small hole in the shell.

• THINK: A pinhole starts with tiny damage to the egg shell.

• ACT: Check the inclination of the nest box and protruding parts in the next box (possible pressure on egg points when falling).