My guess is this is a wild turkey hen trying to hide her poults in the tall grass. She probably had them out for a nice grasshopper hunt on a balmy June morning. but when she encountered me, she went renegade.
Unlike suburban wild turkeys, which appear clueless dumb, those from pressured populations behave with all the stealth of a well-trained and well-seasoned sniper. Any mistake and the shotguns will get you.