The blue-billed hanging can grow up to 13.7cm. It generally lives in the coral reef waters of the western Pacific Ocean, and mainly feeds on macroalgae, silk algae and single-celled algae attached to gravel. Therefore, if artificial rearing, these foods are also the main food.

As for what it is called blue-mouthed hanging, it is because of its < span style=font-size: 1em;>The head has small yellow spots, and the muzzle and chest and abdomen are blue, so it is named Blue Mouth Hanging.