These are fairly feral, very noisy, and quite adorable birds. Their eggs are lovely and the meat is good, but the major reason people keep guineas is that they don't like strangers. Heck, they don't like familiar people turning up in unfamiliar hats. When something odd turns up, they surround it, stretch their heads toward it, and yell at the top of their not-inconsiderable voices.
They have thus a reputation for scaring off foxes, wild dogs, and snakes. Not because they're aggressive, but because they're noisy.
Their eggs are a little smaller than chicken eggs, and extraordinarily hard. They have a lovely rich flavour that's not at all "gamy". High season for guineafowl eggs is December - February.