Why do crabs walk sideways?



  • Crab belongs to the phylum Arthropoda and the class Malacostraca with division Decapoda.
  • Crabs belong to the infraorder Brachyura (in Greek Brachy=short, oura=tail), which means they all consist of a short tail which is probably hidden inside the body.
  • Crabs can be found in Oceans, in fresh water and even on land across the world.
  • Crabs are found to be covered with a coat of exoskeleton and a single pair of pincers.
  • Crabs can vary in size from the smallest size equal to few millimetres wide and the longest size equals 4-meter legs.
  • Crabs are omnivorous in nature.
  • Crabs can communicate to other crabs by drumming or wavering patterns through their claws.

Why does crab walk sideways?

  • Crabs have a unique speciality about them, unlike other animals, they are found to walk sideways.
  • The reason behind them walking sideways can be said that they have stiff jointed legs, which moves faster and easier while walking sideways.
  • Crabs have their leg joints on the side of their body.
  • Just like us, their knees bend in a straight line only.
  • But just because of the location of the presence of their joints, they move sideways instead of straightways.
  • The advantage of moving sideways walking can be taken as no tripping of legs on one another.
  • Because of sideway walking, there will be no intercommunication between two legs, hence preventing the tripping due to owns leg.

Fun Facts:

  1. Crabs are found to walk in all directions, walking sideways is their main direction.
  2. Crabs are known as decapoda, which means they have 10 legs.
  3. The lifespan of small crabs can range from 3-4 years, whereas on the contrary the larger crabs can be found to live about 100 years.

Related Questions:

  1. What kind of food, crab eats?
  2. What is cracinisation?
  3. Name different species of crabs.

True or False:

  1. Crabs belong to the phylum Arthropoda.
  2. Crabs are herbivorous in nature.
  3. Crabs are known to walk in a straight direction.
  4. Crabs have three pairs of pincers.
  5. Crabs can be found in only freshwater.

Objective Quiz:

  1. Crabs can be found in ______.
    1. Freshwater.
    2. Ocean.
    3. Land.
    4. All of the above.
  2. Crabs are _______ in nature.
    1. Carnivorous.
    2. Herbivorous.
    3. Omnivorous.
    4. All of the above.
  3. Crabs walks ______.
    1. Sideways.
    2. Round ways.
    3. Both 1) and 2).
    4. None of the above.
  4. The external coating of crabs is made up of _______.
    1. Exoskeleton.
    2. Endoskeleton.
    3. Muscles.
    4. None of the above.
  5. The knees of crabs bend in a _____.
    1. Straight line.
    2. Slant line.
    3. Cure line.
    4. None of the above.

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