There's A Great Explanation For Why Some Enemies Are Bigger Than Others In Dead Island 2
Games have to have big enemies. You can stomp on Koopas' noggins all day long, but battling Bowser takes a little more effort. You might quickly dispatch Pidgeys with your starter Pokemon, but Pidgeotto could bust out Wing Attack on your unsuspecting ass. Games are designed to get more challenging as you climb the difficulty curve, and that usually means introducing bigger, stronger enemies to test your skills. Dead Island 2does this, too....