Green Wood Hoopoe (Phoeniculus purpureus)
Actually quite black looking. & immature as the black and not green bill shows. But as Martin pointed out to me a while back, the Black Wood Hoopoe (Rhinopomastus aterrimus) is smaller and lacks the long tail. Let me add also according to Barlow/Wacher, the eye is red/orange and not black. So Green Wood Hoopoe it is.