I wouldn't be surprised if they could sound and hear subsonics. They sound like maga-beasts. They do tend to be careful around people. I wouldn't want to startle one of mess with a calf, though. When one panics, they all panic.
RE: the picture. As an old dairy country boy, I can tell you that Jersey cows have the reputation of being the most dangerous of milk cows. Stomp farmers into peanut butter with alarming regularity.