If used as a noisemaker , the crest could also have provided recognizable differences for different species or sexes , because the differing layouts of the nasal passages corresponding to the different crest shapes would have produced intrinsically different sounds .
If used as a noisemaker , the crest could also have provided recognizable differences for different species or sexes , because the differing layouts of the nasal passages corresponding to the different crest shapes would have produced different sounds .