I'm trying to remember the bird that stands guard for another species, and mimics their alarm calls on seeing predators, but when hungry throws in an occasional

I'm trying to remember the bird that stands guard for another species, and mimics their alarm calls on seeing predators, but when hungry throws in an occasional lie so that they drop their food and run. Something African I think. Edit: I was thinking of the Fork-tailed Drongo, which does this to meerkats. https://en.wikipedia.org/wiki/Fork-tailed_drongo#Kleptoparasitism https://en.wikipedia.org/wiki/Fork-tailed_drongo#Kleptoparas...