Despite not being as colorful as the banded coral shrimp, the wee Periclemenes pedersoni, is one of the most well known and abundant cleaner shrimps. these shrimp show their willingness to clean fish by frantically waving their antennae. When the fish approaches, the shrimp literally dives head first into work, sometimes disappearing inside the fish’s mouth in order to clean its gills. the fish wiggles its head lightly to warn the shrimp it is time to leave. Due to the important service they render, researchers rarely find cleaner shrimp or fish in stomach of predators.