sentence2_structure: aggressive type of displays<>are<>common<>in the animal kingdom$$$aggressive type of displays<>serve<>as a 'bluff<>sometimes
sentence1: It is the display of temper or aggressive driving by a motorist, towards other motorists (or sometimes pedestrians).
sentence2: Exemplified by baring teeth, aggressive type of displays are common in the animal kingdom, and sometimes serve as a 'bluff'.
question: Exemplified by baring teeth, what type of displays are common in the animal kingdom, and sometimes serve as a 'bluff'?