Tula does sounds more like a gander, When I got Missy Sam was already over 5 yrs old and had bonded to the Muscovy duck who hatched him, so he didn't want anything to do with Missy he would actually charge at her to drive he away, so after watching this for a couple weeks i finally separated him from his mate the Muscovy and it still took from August to Jan for them to actually bond. Mating season is what cinched the deal with my 2. My gander is very vocal and right in your face especially this time of year I had to literally hold him to the ground 2X yesterday when he comes at me to bite me, I don't let him even bite my boot because it will escalate from there. It's just their nature to be protective. Missy is aloof too she will mainly stand back and watch all the goings on, she does make noise it's low pitched where Sam and Babe shriek it hurts the ears. So when you hear Tula making noise is it low pitched or high pitched? Also Sam and Babe walk around with head up and stand mainly that way too always on guard where Missy and Toots just walk around in normal stance.