The best and easiest place to spot these guys are from the window viewing in Cafe Maya located to your left right when you walk up the entry stairs, located diagonally across the room. It's pretty impossible to see them from the actual path in Mundo Maya. The Black Hawk-Eagle is the next most difficult, with them actually being exhibited above the Cafe Maya viewing area My only viewing of them was through the agouti and Spectacled Owl enclosure. The Guianan Crested Eagle isn't too difficult (even though it's the last one I found and only with the help of an employee), located at the far side of the room opposite the Jaguar entrance. The Harpy Eagle is easy, with there being an actual viewing area for the enclosure.
Well, the black hawk eagle exhibit can be seen from windows looking up to it from within the cafe itself. Also the only reason @ThylacineAlive found them and a lot of other stuff is because he was messaging me the whole day
