You busted me! By looking at your avatar, it appears you have a grapple very similar to mine. I've used mine to move a lot of individual rocks and small boulders but haven't tried using it on a whole field yet. Seems like you could get it at the right angle and then just make a pass with the FEL in float to scoop 'em up no?
Funny story. Earlier this summer, my parents were up visiting and my mom was helping my wife plant some decent sized shrubs in a new landscape island she was installing, 3-5 gallon bucket sized roots. They were having a hard time digging the holes for the shrubs with all the rocks so while they were taking a break, I dug the holes, tossed all the rocks in the bucket of my tractor while my father went and dumped them at my creek crossing. I left the nice little piles of dirt next to each hole and go about my business spreading mulch or whatever. About an hour later, my father and I see my wife and mother standing around the half planted shrubs with the most confused look on their faces. Basically, by the time I removed the larger rocks from the dirt piles, there was not enough dirt left to fill in the rest of the holes despite the 3-5 gallons of dirt that came with each plant. They were standing there trying to figure out how the heck it was possible to dig a hole, add a 3-5 gallon root ball, and then not have enough dirt to fill the hole back up!