Ultimately, the oversized nose of the male proboscis monkey is a prime example of a morphological feature that has been intensely shaped by social and competitive pressures within a specific ecological niche. It functions simultaneously as a visual marker of dominance, a resonant sound amplifier, a threat display tool, and a signal of fitness, all of which contribute profoundly to the establishment and maintenance of the species' distinctive social structure and the overall dynamics of group stability.
