A couple of years ago I was called out to "rescue" a golden eagle who couldn't fly. He'd apparently been in the same area for several days and seen by a number of hikers and dog walkers.

I finally located the mature bird sitting on a rock. He seemed about the size of a German Shepard with a fearsome beak and talons borrowed from a Velociraptor. I crept towards him holding the blanket I had to wrap him in (which seemed a feeble defence) when he took to the air and flew fairly awkwardly downslope into a tree. On further examination I found a deer carcass nearby on which he had been feeding. I don't know if he had killed it or found it but it was obvious he was gorging himself on it and had no intention of moving far away until he had consumed the whole thing. He could fly just fine but he didn't want to leave...and he was weighed down with venison.