What were the primary functions attributed to the visual display of the crest in life?

Answer

Signaling sexual fitness or dominance for mate selection

The size and bright coloring of the crest served as a visual tool, signaling superior health, genetic fitness, or dominance, particularly critical in the competitive arena of mate selection.

What were the primary functions attributed to the visual display of the crest in life?
paleontologydinosaurParasaurolophusCresthadrosaur