I enjoy having guinea fowl, I like to keep them as they are great for letting you know if there is something different around, and for tick patrols and for deterring snakes. They are quite difficult to determine male from female by just looking at them. Older males have bigger wattles and bigger helmets on the top of their heads, but when younger, are very difficult to tell the sex of. Other than by the noises they make. Females have a definite two syllable sound as per my video below.
Males have a different noise, like the videos below.
They can be quite noisy, but they don't go on like this all day, and as you can hear in the videos, our farm isn't exactly quiet anyway!
Our light sussex are about 6 weeks old now, and they are all growing quite well. They are an easy breed to tell the sex of quite early, as you can see below.