Why Crabs Walk Sideways

Ever wondered why crabs don't walk forward? Here is why...

To make it easy to bury themselves into sand or even squeeze into narrow spaces, they are made with a wide, flattened shape. With their shape it restricts movement at the 'shoulder' joints of their legs. It is actually possible for a crab to shuffle forward, but only slowly. By flexing the second joint of their legs they can move much faster. Their joints are like a humans knees, simple hinges, difference is they move sideways. 

Some crab species do move forward

Now you know that a crab can move forward, they just choose not to.

For a video of why crabs move forward click here.

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