I thought the same how green the grass is. I have a lot of birds. These are the pens. The grass disappeared years ago. Sometimes I leave a pen empty for awhile but no grass grows but the weeds sure do.It's amazing that your lawn still looks healthy! We have a similar size covered with heavy birdnet but divided into two parts. I can see a big difference between the two zones after two weeks of letting them roaming in one zone. Just started to limit their hours on the lawn starting last week. I plan to switch zone every two weeks.