A new born hen with shell

You're referring to a "pipped" egg!

A pipped egg is an egg that has been laid by a hen and has a small hole in the shell, usually at the large end. This hole is made by the chick inside the egg, which uses its beak to break through the shell and start breathing.

Here's what happens:

1. The chick develops inside the egg and grows, using the yolk and white for nutrition.
2. As the chick grows, it starts to feel the pressure of the shell and needs to get out.
3. The chick uses its beak to break through the shell, starting with a small hole.
4. The chick then pips, or breaks through, the shell, allowing it to breathe and start its journey out of the egg.

The shell of a pipped egg is usually still intact, but the hole allows the chick to breathe and start its development outside the egg. It's a crucial step in the hatching process, and it's an exciting moment for chicken keepers and breeders!

After pipping, the chick will continue to break out of the shell, a process called "hatching." This can take anywhere from a few hours to a few days, depending on the breed and size of the egg.