Run substrate for winter climate.

[Isaac 0]

What's the difference between a run and a pen?

I assume a pen means a very large run and run usually means a small outside enclosure attached to the coop.

We will see what @DuckyDonna says.

 

[DuckyDonna]

What's the difference between a run and a pen?

To me a pen is where they are locked up for the night to sleep. A run is where they run around all day long