Generally the farther north you go the bigger the moose will be. All moose are going to look huge so it is hard to determine the size of the animal. You want to look for a couple main antler characteristics to see if your bull moose is mature. If it has the tri-palm bottoms (3points on the bottom paddles on each side), it most likely is mature. If it has big, wide, and tall paddles on top it is a mature bull. If it has short skinny top paddles or no paddles, it is a immature bull. Immature bulls are referred to as spike bulls as they have not yet developed paddles.