Monday's Hawk Sighting

Monday evening, I noticed that the hawk was back in the tree. Then, I saw there was a baby rabbit in the field. I thought maybe the hawk was waiting for the rabbit to come out further before it could swoop down and get it. I waited about 10 minutes and watched as the hawk fly down to the ground and then back to the try no where near the rabbit. Maybe he was not hungry, but what was he getting from the ground? After waiting, I took the the dogs outside to potty and the hawk flew off.