Odontodactylus scyllarus is a smasher, with club-shaped raptorial appendages. An active hunter, it prefers gastropods, crustaceans, and bivalves, and will repeatedly smash its prey until it can gain access to the soft tissue for consumption. It is reported to have a "punch" of over 50 miles per hour (80 km/h). This is the fastest recorded punch of any living animal. The acceleration is similar to that in a .22 caliber handgun, with 340 pounds-force (1,500 N) per strike. In addition, the surface of its appendages is made up of extremely dense hydroxyapatite, layered in a manner which is highly resistant to fracturing. Glass aquaria can be broken by them. The composition is being investigated for potential synthesis and engineering use.