Sensory cues underlying competitive growth in the clown anemonefish (Amphiprion percula)

• In animal societies, access to breeding often depends on social rank. • Rank often depends on size, favoring evolution of competitive growth strategies. • In some societies, individuals adjust size in response to size of their competitors. • Clown anemonefish paired with size-matched rivals exhibit competitive growth. • Mechanosensory cues are used to assess size and initiate competitive growth. In some animal societies, access to breeding...