Starfishes are spiny-skinned sea animal that live in all oceans of the world. They have thick spikes or arm-like extensions on the body.
Starfishes are able to move equally well in any radial direction because of the structure of their body. The body of a starfish is made up of a center with five or more spikes radiating out of the center like spokes of a wheel.
Most kinds of starfish have five such spikes. This makes them look like five pointed stars. Some species of starfishes have as many as 40 or more spikes.
These spikes, which are used by the starfish for many different activities including movement, make it possible for the starfish to move in any radial direction with equal ease.