I'm not surprised. Hunters in general know wildlife better than the average person. Animals have proper names. It's so everybody knows what you're talking about and is on the same page.
If you told me you saw a lamb with no picture. I'd assume you saw a baby sheep. It makes it easier than making up names. Would you call a moose an elk? It's no difference.
In talking to you in a PM I can see you're a good guy. It's just the name thingy that's a bit strange.