Interesting bird at Zoo

Subject:

Comments:
I saw an interesting bird at the Miami Zoo today at the gorilla enclosure. It had a black cap and back and white breast and long white tail. I didn't have binoculars and saw it from a good distance but it definitely was something outside of the norm. Structurally it reminded me of a cuckoo. Anyone know if any exotics have escaped from the zoo lately? I suppose a leucistic Boat-tailed Grackle could also be a possibility but it's plumage looked too clean for that. I have a real bad cellphone photo which I've attached to give a sense of what it looked like from a distance.

Optional Link URL:
Link Title:
Optional Image URL: