How Do Crustaceans Protect Themselves?


Crustaceans are a diverse group of mostly aquatic animals found all over the globe, from shallow seas, to tide pools, to the abyssal depths of the deep oceans. Crustaceans, such as crabs and shrimp, are relatively low on the food chain and are often preyed upon by fish, sea mammals, mollusks (including octopi), and humans. As a result of this, crustaceans have developed several ways to protect themselves from potential predators.


  • Most crustaceans have hard exoskeletons. Known as the carapace, these are essentially the animals body armor, keeping hungry predators from biting down on it. The carapace protects all of the animal's vital organs and in some cases must be cracked before it can be eaten (some exceptions include krill and shrimp, which are typically eaten with their exoskeletons). However, in order to grow, the carapace must be frequently shed and regrown in a process known as moulting. During a moult, the crustacean may be very vulnerable to attacks.


  • Most crabs and lobsters come with a set of large pincers that can help them defend against predators. Lobsters have very powerful claws capable of severely damaging any attacking animal, including a human being, which is why you often see the claws banded shut in restaurants. They also use their claws and pincers for eating, often digging up food items in the sand or tearing chunks of meat off any detritus (dead animals) they may come across.

Portable Homes

  • The common hermit crab employs a very famous technique for defending itself. Though it has very strong pincers like other crustaceans, it has a very soft body, so it takes refuge in empty shells. Any shell big enough for the crab to inhabit it moves into, including snail shells and conch shells. The shell provides a shelter, and the crab will carry it along its journey, swapping it for a bigger shell whenever it grows.


  • Many crustaceans use camouflage to hide from predators. Some, like mud crabs, have shells that often match the color of the surrounding sand and mud. They will bury themselves in the muck, hiding from potential predators. Crabs that live on coral reefs are often very brightly colored, blending in seamlessly with the surrounding, colorful corals.


  • If all else fails, crustaceans will simply flee. Crabs can use their six legs to scurry away from predators very quickly and hide among rocks or under mud. Shrimp propel themselves through the water by convulsing their bodies and moving their tails, allowing them to move quite rapidly away from predators. Many swimming shrimp are often known for traveling in large numbers, reducing the chances of a single shrimp being singled out and eaten.


  • Photo Credit crab image by Tony Fortunato from
Promoted By Zergnet


You May Also Like

  • How Does a Chimpanzee Protect Itself?

    As reported in National Geographic, geneticists agree that chimpanzees are humans' closest living relative, sharing 98% of their DNA with humans. This...

  • How Do Raccoons Protect Themselves from Predators?

    Most people first get acquainted with raccoons when they find this bushy-tailed mammal rummaging through their garbage in search of food. Raccoons...

  • How Do Seals Defend Themselves?

    At first glance, their large bodies and short fins appear to make seals easy targets for predators and others that would compete...

  • How do Mussels Protect Themselves?

    Mussels are mollusks that live in freshwater and saltwater. Not only do humans enjoy eating mussels, but so do various other aquatic...

  • Types of Camouflage Toads

    Like many amphibians, toads are able to camouflage with their backgrounds and surroundings of its natural habitat. Toads can be identified from...

  • List of Hermit Crab Predators

    Hermit crabs are one of the most widespread crustaceans on the planet. There are over 500 different species, ranging in size from...

  • Why Are Lobsters Cooked Alive?

    Lobsters are cooked alive because lobster meat goes bad very quickly and will release self-digestive fluids that can spoil the meat. Keep...

  • How Do Gorillas Defend Themselves?

    Gorillas defend themselves through their huge size, but also by staying in tight-knit groups to help watch out for predators. Understand how...

Related Searches

Check It Out

How to Build and Grow a Salad Garden On Your Balcony

Is DIY in your DNA? Become part of our maker community.
Submit Your Work!