Boyd’s Bible Dictionary:
(sacred eagle). An unclean bird of prey; probably the Egyptian vulture (Lev. 11:18: Deut. 14:17).
Concise Bible Dictionary:
The name occurs only in the list of birds not to be eaten. Being classed with the swan and the pelican, it has been thought to be some water-fowl; but it is more generally considered to be the Egyptian Vulture. It visits Palestine only in the summer. It eats any carrion, and is highly respected in the East (Lev. 11:18; Deut. 14:17).
Egyptian Vulture