Starfish or Sea Stars, Brittle or Basket Stars live on the seabed in all the world's oceans, from warm, tropical seas to frigid polar regions. About 1900 species of starfish can found at abyssal depths, 20,000 feet below the surface.
Starfish are cute marine invertebrates, have a central disc and usually have five arms but can have more. The surface of their body can be smooth, granular or spiny. Many species come brightly colored and in various shades of red, orange, blue, grey or brown.
Starfish have tube feet operated by a hydraulic system and a mouth at the center of the oral or lower surface. They are opportunistic feeders and are considered predators feeding on other invertebrates.
Most can regenerate damaged parts or lost arms and can shed arms as a means of defense.
But not all starfish are defensive, the tropical Crown-of-Thorns starfish is a voracious predator of coral throughout the Pacific and the Northern Pacific Sea star is on the list of the World's 100 Worst Invasive Alien Species.
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