It looks like a soft landing spot to me. I captured this broken winged butterfly at Como Park in St Paul this past summer. The park has a new butterfly building to the grounds. I'm not sure if this is a permanent feature to the park or if it was only for this year. One can literally walk among 60 to 70 butterflies in the netted area. You are warned to watch your step as the winged creatures will rest on the walking path.