Guinea fowl are flock birds. They require and do best in large numbers. They cannot experience proper flock dynamics if kept in too few of numbers.3. Temperament: Guinea fowl are independent birds that can be kept in flocks or pairs. They are highly social and vocal, often communicating with each other using a distinctive "chu-chu-chu" call. Guinea fowl are also known for their loud squawking, which can be heard from a distance.
I don't have any idea where you came up with "chu-chu-chu" but in my many years of raising guineas, I have never heard a guinea make that sound.