Mantis shrimp

The mantis shrimp lives in the sea.

It has very strong claws.

Some shrimp use claws like spears. They use them to grab soft food.

Other shrimp have clubs for claws. They use them to smash hard shells.

These shrimp have bright colors.

Their eyes are very special. They can see many colors. They can even see light that humans cannot see. It is amazing to see the world through their eyes!

Mantis shrimp are sea animals that live in warm waters.

They are famous for their powerful claws. These claws help them hunt for food.

There are two main types of mantis shrimp. Spearers use sharp, spiny limbs to grab soft animals like fish. Smashers use heavy, hard clubs to crack shells.

Smashers strike with incredible speed. This fast move makes tiny bubbles in the water. We call these cavitation bubbles. When these bubbles pop, they hit the prey too. This means the prey is hit twice in one strike!

Mantis shrimp also have the most complex eyes in the world.

Their eyes sit on stalks that move in every direction. Each eye has many tiny parts called ommatidia. These parts help them see many colors. Humans have only four types of light sensors. Some mantis shrimp have up to 16 types! They can see ultraviolet light and even polarized light.

This helps them see their world in a very special way.

Mantis shrimp are fascinating marine animals that live in warm waters.

They belong to a group called Stomatopoda. These creatures are very important predators in shallow tropical seas. Many species hide in holes or burrows to stay safe. Because they hide so much, people do not know everything about them yet. Some people call them "sea locusts" or "prawn killers." Others call them "thumb splitters" because their claws can cause painful wounds.

These shrimp use special limbs called raptorial appendages to hunt. There are two main ways these limbs work. Spearers have sharp, spiny limbs used to stab soft animals like fish. Smashers have heavy, hard clubs used to crack shells.

Smashers strike with amazing speed and power. They move so fast they create tiny bubbles in the water. These are called cavitation bubbles. When these bubbles collapse, they hit the prey a second time. This can even create light through a thing called sonoluminescence.

Scientists have studied these animals for a long time. Mantis shrimp split from other sea creatures about 400 million years ago. The group called Unipeltata appeared around 250 million years ago.

Today, there are more than 520 different species known to science. Some species are small, but others can grow quite large. For example, the zebra mantis shrimp can reach a significant length. Researchers even study their claws to help build new types of materials.

Their eyes are perhaps the most amazing part of their bodies.

Mantis shrimp have the most complex eyes ever discovered. Each eye is made of thousands of tiny light sensors called ommatidia. These eyes sit on stalks that move in many directions. This allows them to scan their surroundings very quickly. They can even move each eye independently to track moving objects.

This helps them stay safe in their busy, crowded habitats.

Most humans have only four types of light sensors in their eyes. Mantis shrimp can have between 12 and 16 different types.

This means they see colors that humans cannot see at all. They can see ultraviolet light and even polarized light. Some species can even change how they see light to fit their home. This special vision helps them find food and protect their territory. It is a truly incredible way to experience the ocean world.

Mantis shrimp are highly specialized carnivorous marine crustaceans belonging to the order Stomatopoda.

They are essential predators within shallow tropical and subtropical marine habitats. These creatures have a very ancient lineage, having branched off from other Malacostraca about 400 million years ago. All living species belong to the suborder Unipeltata, which emerged roughly 250 million years ago. Today, scientists recognize more than 520 extant species of mantis shrimp.

Because many species spend most of their lives hiding in burrows, they remain poorly understood by researchers.

The most famous feature of the mantis shrimp is its raptorial appendages.

These are specialized second pairs of thoracic appendages used for close-range combat and hunting. Mantis shrimp are primarily classified into two functional groups based on these limbs: spearers and smashers. Spearers possess spiny appendages with barbed tips, which they use to stab and snag soft prey like fish or cephalopods. Smashers, however, possess heavily mineralized, club-like appendages. These clubs are divided into three distinct subregions: the impact region, the periodic region, and the striated region.

Some species, like those in the family Hemisquillidae, are considered unspecialized "spike smashers" because their limbs lack spines except at the very tip.

The mechanics of a smasher's strike are among the fastest movements in the animal kingdom. When a smasher attacks, it rapidly unfolds its raptorial claws with incredible acceleration. This acceleration can reach 10,400 g, which is 102,000 m/s². This speed causes the appendage to generate vapor-filled bubbles in the water, known as cavitation bubbles. When these bubbles collapse, they produce a secondary shock wave. This means the prey is struck twice: first by the physical impact of the club, and second by the collapsing bubbles. This impact can reach forces of 1,500 newtons. The collapse of these bubbles can even produce light, a phenomenon called sonoluminescence.

Beyond hunting, the mantis shrimp possesses perhaps the most complex visual system ever discovered.

Their eyes are mounted on mobile stalks and can rotate in all three dimensions. Each eye is a compound eye made of tens of thousands of ommatidia, which are clusters of photoreceptor cells. The eye is divided into two flattened hemispheres by a specialized row of ommatidia called the midband. This midband contains between two and six rows of cells. This unique structure allows for trinocular vision, providing depth perception for objects near the eye's mid-plane.

This allows them to perceive shapes and motion with extreme precision.

The diversity of their photoreceptors is staggering when compared to humans. While humans possess only four types of photoreceptor cells, some mantis shrimp have between 12 and 16 types.

This diversity is believed to have resulted from ancient gene duplication events. These cells allow them to perceive a massive range of light, from deep ultraviolet at 300 nm to far-red at 720 nm. They can also detect polarized light. In certain superfamilies, the midband is specialized: rows 1 through 4 process color, while rows 5 and 6 detect circularly or linearly polarized light. This complex array of sensors allows them to navigate and hunt in diverse environments.

Some species exhibit a remarkable ability called spectral tuning. This is a species-specific phenomenon where they adjust the sensitivity of their long-wavelength color vision to match their environment. For example, the species *Neogonodactylus wennerae* shows more pronounced tuning than *N. oerstedii* because it lives in habitats with higher ecological diversity. This ability is likely linked to mutations in the retinal binding pocket of the opsin, which is a light-sensitive protein. By tuning their vision, these crustaceans can adapt to different depths and light conditions. This ensures they can maintain high-speed processing of their surroundings, which is vital for territorial combat.

The biological complexity of the mantis shrimp has significant implications for modern science. Researchers are currently studying their powerful, robust claws as microscale analogues for new macroscale material structures. Their ability to withstand such intense physical forces is a subject of great interest. Additionally, the way their visual information is processed into parallel data streams provides insight into efficient sensory systems. From the physics of cavitation to the biology of advanced optics, the mantis shrimp remains a subject of intense scientific study. They represent a perfect intersection of mechanical power and sensory sophistication.