Okie, all I can say is "Jaaa Boet !"
Nan, Since the Macaw has his cage in a spot with a wide and elevated view of a large part of the garden we have seen monitor, numerous hawks and eagles and now the owl - all because he has a recognizable sound for far-off danger and an earth shattering alarm scream for nearby danger. Most of the time we would go and see what is exciting him and most often it is the local Fish Eagles who are regularly seen/heard 2 -3 times a day as they fly past.
We have many pelicans, woolly neck storks, herons, hadidas ( the Macaw's friends ) that fly past an none of them ever elicit a alarm call but surprisingly the Gray Headed Bush Shrikes makes Crush ( the Macaw ) very worried.
This brings me to another interesting observation we have made - Our Fork Tailed Drongos are like every-where else ruling the roost by chasing crows and the such-likes away but when the Gray Headed Bush Shrikes arrive the Drongos back off !
Gerrie.