I currently have 2 cocks and 29 hens, 1 guinea cock and 1 guinea hen. The guineas are great at keeping the aerial predators away, haven't lost a chicken to a hawk since getting guineas, however I do have trouble with foxes and weasels. I've heard that large breed geese are good at warding off small ground predators and just make for an extra security measure. My birds free range the open yard (about 1-1/2 acres) and the woods and wetlands surrounding (10 acres, though they don't go far). Is keeping just one gander among the chickens and guineas unreasonable? I've read that for him to be protective of the flock he can't have other geese to bond with, rather he has to be raised among the chickens and bond with them. I'm interested in a brown African gander since they are large, friendly and quite pretty.