Go vertical if you have the room. Put in lots of ramps and places to perch. They like grass and small plants. For construction, we did a two by four frame with

Go vertical if you have the room. Put in lots of ramps and places to perch. They like grass and small plants. For construction, we did a two by four frame with welded wire covering it. The welded wire is very secure but still allows a nice view, and is pretty cheap. If you have a Tractor Supply store near you in US) they have it.