Found actively exploring a lawn, with a parent in attendance (who didn't seem particularly perturbed by my presence on the sidewalk a few feet from the baby, but did retreat & wait for me to leave). While it's no longer in the nest, it may not really be able to fly (opinions?), so I'm not sure you could call it a fledgling. Perhaps fell from its branch prematurely & will be tended on the ground until it can fly (assuming some predator doesn't pick it off)?