The word 'northern' is problemmatical and I'm not sure how I'll develop an explanation for understanding when to capitalize it and when not to.
Well, if you do, would you explain it to me? I wondered about something like the northern flicker. Morgan, and arctic fox surprised me also, esp. Morgan. I'll bet that if most of us, out of the blue, announced to a friend that we were going to buy a Morgan, very few would immediately know we were referring to a horse.