The Father of the Modern Animal Rights Movement

I often hear you described as the father of the modern animal rights movement. Do you think that's something of a misnomer if being a utilitarian, you're sort of looking at consequences and welfare of animals rather than something like a deontological right? I think it's something ofa misnomer when I'm speaking to philosophers or people who are well-educated in philosophy. So for them, they would say, how can a utilitarian be an animal rights advocate?