Riddle Fun!

I am seen traveling alone rather than in a pack;

I am big and clumsy with four hooves;

Wandering around the forest looking for some grass to eat;

Always on the alert just in case something goes wrong;

Running away whenever I hear a leaf crunch;

I never stay in the same place for a long period of time;

My smaller cousins live in the North Pole with Santa;

I charge at my enemy whenever I feel frightened;

Many of my enemies want me for their trophy case;

I am a prize collection on the wall of my hunter;

People sometimes say I look like people they know;

Can you guess who I may be?