You are more likely to hear the clicks and snaps of the Pistol or Snapping shrimp then see them. They are common animals but are usually hidden in burrows, under rocks and even carpet anemones!
Pistol shrimp have one greatly enlarged pincer. In some, it be as long as the entire body!
This enlarged pincer has one moveable 'finger' held apart with a catch. When the catch is released, and explosive sound results. This blast of sound energy is used to stun prey, crack shells, ward off predators and intimidate rival shrimp.
This individual was observed during a low tide, gleefully swimming out of the Hantu Kecil lagoon with its pincers held forth like Superman in flight! It looked as if it was having a peaceful time of solitude amidst the expansive ocean.
Extracted from the Chek Jawa Guidebook