+A crab is a [crustacean](/wiki/crustacean) distinguished by its hard external [shell](/wiki/shell) and ten jointed legs. These diverse creatures typically walk sideways, inhabiting various marine and freshwater environments across the globe.
+## See also
+- [Shrimp](/wiki/shrimp)
+- [Lobster](/wiki/lobster)
+- [Marine Life](/wiki/marine-life)