Cape Crow
Corvus capensis
Voice: The voice is described as a krrah.....krrah.....krrah or a quicker kah-kah-kah. It also makes very loud, liquid bubbling sounds that carry quite a distance; it also gives throaty chuckles. Some evidence indicates that vocal mimicry is practised, too.
ID text from Wikipedia, CC BY-SA 4.0
White-necked Raven
Corvus albicollis
The white-necked raven has a much shorter tail than the common raven, as well as a deeper bill with a white tip that is almost as strongly arched as that of the thick-billed raven. Though predominantly black, the throat, breast and neck show a faint purple gloss. There is a large patch of white feathers on the nape of the neck. It soars well, with shallower wingbeats than other Corvidae. Voice: Often described as a raven with a sore throat, it has very similar calls to the common raven, but with a more husky note. It has a croak like the other raven species but with a more whispering note. Like all corvids, the White-necked raven is capable of vocal mimicry. However, this behavior is only ever recorded in captivity.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Cape Crow and White-necked Raven.