It’s evident that the sentence above is comparing two things; a crab and a person. There are a couple of core literary devices that deal with comparisons: similes and metaphors.
Let’s look at how they are different.
Metaphor: compares two unlike things WITHOUT using like or as.
• Example: Her eyes are the sun.
Simile: compares two unlike things using like or as.
• Example: Her eyes are like the sun.
Read the sentence again and see whether it follows the rules of a metaphor or a simile.