I have a Brown Chinese that is a year and two goslings that I hatched April 1st that were suppose to be pure pilgrim but I suspect that one is a cross and they are all loud and very territorial. I feel that this can be a learned behavior as well as an instinctual one. I think the brown Chinese adopted all of the ducks and learned to sound off from the guineas last year and has now taught this behavior to my goslings.
I just acquired four adult pilgrims and was told by their previous owner that they can be quite noisy, once they get comfortable. I am actually looking to make them a new pen further in the back yard, as to shelter them from too much stimulation, they can honk for hours non-stop and I am thinking 7 geese sounding off next to my house is not a good idea.