Yeah, he's definitely an aardvark. In the first Arthur book, he looked like an actual aardvark.
As time went by, he evolved into...guy with ears on top of his head.
I think Brain was a bear though. I don't know if they had mice, but Mr. Ratburn was, in all probability, a rat.
I never really got into this show. I was more of a Rescue Heros' and Blue's Clues' guy. <br>