What functional interpretations were suggested for Xiongguanlong's long nasal structure besides biomechanical feeding requirements?

Sensory capabilities or intraspecific signaling/visual displays.

Given that the snout of *Xiongguanlong* appeared relatively lightly built compared to the jaws of heavy-duty predators, alternative functions for its elongated facial structure were considered. One compelling functional interpretation suggests the snout was adapted for enhanced sensory inputs, potentially concentrating olfactory tissues to improve the sense of smell for locating prey. Furthermore, the extended structure might have served a role in intraspecific communication, acting as a visual display element, perhaps covered in keratin, used during threat displays or ritualized interactions between members of the same species, similar to structures seen in other extant animals.