What feature in *R. pachyrhynchus* suggests it might have engaged in complex sexual signaling behaviors?
Answer
Bony depressions near the external naris.
The presence of bony depressions near the external naris (nostril) in *R. pachyrhynchus* is an osteological correlate that hints at the possibility of a *ghara*, the soft tissue knob found on modern male gharials used for signaling.
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