Frill-necked lizards puff out these neck frills on either side of its head when threatened. The lizards often raise their frills when battling for territory or when coming into contact with another lizard, especially during mating season. Acoustic measurements from the frill-necked lizard suggest that the frill does not affect binaural hearing for localization but may increase gain for sounds from directly in front of the lizard.
When frill-necked lizards feel threatened, they puff out their neck frills on either side of their heads. These lizards often raise their frills during territorial conflicts or when interacting with other lizards, especially during mating season. Acoustic measurements indicate that the frill does not affect binaural hearing for sound localization but may increase gain for sounds directly in front of the lizard.