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Cinnyricinclus leucogaster
Very skittish! Could not get close for a better photo.
Hi Johan Heyns
In order to assure the accurate information on PN, I took a liberty to curate your spotting, and change the ID and references from Purple to Violet-backed Starling (a.k.a. Plum-colored or Amethyst starling). Purple starling is purple all-over (including belly), an its distribution do not inlude southern parts of African continent.
Hope you don't mind my intervention.
Cheers
I agree with Zlatan, the purple Starling has a purple head, turquoise back and blue breast/belly.