A mantis shrimp’s punch has been compared by government researchers to the impact of a .22-caliber rifle bullet, and institutional biologists say some specimens have even shattered aquarium glass. That combination of speed and power is drawing new scrutiny from engineers and defense funders who want to copy the animal’s natural armor without inheriting its risk of self-destruction. Recent work on the structure of the shrimp’s striking limb now links that headline-grabbing punch to a quieter feature inside the club: a built-in filter for dangerous sound waves.
Why a rifle-strength shrimp punch matters now
The U.S. National Institute of Standards and Technology describes mantis shrimp as inspiration for impact-resistant materials because their strike delivers energy on the order of a .22-caliber bullet, according to a NIST release on bioinspired materials. That comparison is not just a curiosity for animal lovers. It sets the scale of the mechanical problem facing anyone who wants to build lighter armor or tougher phone screens that can survive similar hits.
At the same time, researchers at Scripps Institution of Oceanography report that mantis shrimp kept in captivity are “known to” crack or shatter aquarium glass, according to an institutional research highlight. For aquariums and hobbyists, that means a small crustacean can become a real hardware risk. For scientists, it shows that even in controlled tanks, the energy stored in the animal’s limb can overwhelm human-made materials.
New work on the club’s internal structure raises a sharper question: what exactly is the shrimp protecting itself from when it armors its own limb. A Northwestern University summary of a 2025 Science paper explains that each strike generates two kinds of shockwaves, one from the direct hit and one from collapsing cavitation bubbles in the water, and that the club’s layered structure filters sound to mitigate damage from these waves, according to the institutional description of how mantis shrimp clubs filter sound. That framing sets up a testable idea: the specialized “phononic” design inside the club may have evolved primarily to blunt the bubble-collapse blast, rather than the initial impact, which would show up clearly if scientists compared strikes in water with different gas levels.
The evidence behind the shrimp’s extreme strike
The starting point for understanding the punch is the spring that powers it. A peer-reviewed review of the “Biomechanical Design of the Mantis Shrimp Saddle: A Biomineralized Spring Used for Rapid Raptorial Strikes” describes the saddle as a biomineralized spring that stores and releases elastic energy for rapid raptorial strikes, according to the paper hosted on NCBI. That saddle sits just behind the club and loads like a crossbow before each hit, which explains how a relatively small muscle can drive such a fast motion.
The same review notes that the saddle’s architecture has been studied using peer-reviewed methods to map how its mineral and organic layers share stress during loading, according to the article available through PubMed Central. By tying specific material phases to energy storage and release, that work gives engineers a blueprint for synthetic springs that can be charged and fired repeatedly without cracking, which is exactly the kind of design NIST points to when describing bioinspired materials that “can take a punch” in its government release on mantis-shrimp-inspired structures.
Speed is the other defining feature. A Nature news feature on mantis shrimp biomechanics states that these animals have the world’s fastest punch and links that status to a 2025 Science paper on damage mitigation in the club, according to the feature explaining how their limbs survive. That same coverage identifies the Science study as focused on how the limb avoids breaking under its own impact, which connects directly to the Northwestern University summary of the club’s sound-filtering role.
The Northwestern description of the 2025 Science paper explains that the mantis shrimp strike produces both impact and bubble-collapse shockwaves and that the club’s internal architecture filters sound to mitigate damage from these waves, according to the institutional page on mantis shrimp clubs and sound. The summary also notes that the Science work received funding from AFOSR, ONR, and NSF, which places the research squarely inside defense and basic science programs that care about high-strain-rate impacts.
That institutional framing suggests the club is not just hard on the outside. It is also structured internally to manage acoustic energy, in the same way that phononic crystals in engineering can pass some frequencies and block others. If the club transmits the lower-frequency content that matters for stunning prey while filtering the higher-frequency content tied to bubble collapse and material fatigue, then the shrimp gains a selective shield against the most damaging part of its own weapon.
Engineers interested in copying this design now have two linked templates: the saddle spring, described in detail in the biomineralized spring review, and the club filter, described in the Science paper and its institutional summaries. Together, they form a natural system that can both deliver and survive rifle-scale impacts in water, which is why NIST highlights mantis shrimp in its government discussion of bioinspired materials that can absorb repeated hits.
What remains unresolved about the club’s self-protection
Despite all this structure, several parts of the story are still missing. The Scripps research highlight notes that mantis shrimp specimens are known to shatter aquarium glass but does not provide formal logs of which species, tank designs, or water conditions are involved, according to the institutional description of small but mighty shrimp. That leaves aquarists and equipment makers without clear thresholds for when a tank becomes vulnerable.
On the biomechanics side, the biomineralized spring review synthesizes peer-reviewed work on the saddle’s structure but does not include long-term field records of how that spring wears across multiple molt cycles, according to the article hosted on PubMed Central. Without those data, it is hard to say how many high-energy strikes a wild mantis shrimp delivers between molts or how often the spring or club fails.
The Science paper on sound filtering, as summarized by Northwestern University, clearly states that the strike produces both impact and bubble-collapse shockwaves and that the club filters sound to mitigate damage, according to the institutional description of mantis shrimp clubs and sound. What remains unresolved is whether that filtering is tuned more strongly to the frequencies produced by the direct hit or to those produced by collapsing bubbles. The working hypothesis that the phononic filtering evolved mainly to suppress bubble-collapse frequencies could be tested by comparing strike acoustics in degassed versus aerated water, but the available summaries do not describe such experiments.
There is also a gap between lab setups and natural habitats. The NIST release on bioinspired materials draws its .22-caliber comparison from controlled impact studies, according to the government description of materials that can take a punch, while the Scripps highlight on shattered glass reflects institutional experience with captive animals. Neither source provides direct force-sensor data from live strikes in the open ocean, which would confirm how often wild mantis shrimp actually operate at the upper limits of their design.
For readers, the practical stakes run along two tracks. Anyone keeping mantis shrimp in home or public aquariums has reason to treat tank material and layout as active safety choices, given that specimens are known to damage glass according to Scripps. At the same time, companies working on protective gear, vehicle armor, or consumer devices can watch how agencies like NIST and funders such as AFOSR, ONR, and NSF back this line of research, because the same structures that let a shrimp throw a bullet-strength punch without self-destructing may shape the next generation of human-made materials.
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*This article was researched with the help of AI, with human editors creating the final content.
