A recently discovered fish species, Danionella cerebrum, barely over 12mm in length, can produce sounds as loud as a pneumatic drill. A study has revealed that this remarkable feat is made possible by a unique sound-production apparatus within the 'translucent fish.' The fish is capable of this due to its specialized cartilage, ribs and fatigue-resistant muscles. Scientists found that the fifth rib of the fish locks into a groove in a cartilage structure and builds tension by pulling the cartilage. The fish accelerates its cartilage at extreme forces, generating rapid, loud pulses of sound by compressing its swim bladder and moving its rib. Genetic adaptations enable the fish to resist muscle fatigue, allowing it to produce a continuous series of sonic pulses.