Starfish, also known as Sea Stars, are one of the most beautiful creatures that are found in the seas. Although they are know as Starfish, in fact they are not fish but echinoderms (a kind of marine animals). They do not have scales, gills or fins like fish. There are about 1800 to 2000 species of starfish. They are usually found in all oceans of the world. They prefer coastal areas and coral reefs.
Starfish have usually five rays or arms but many of them also have 10 to 15 arms. A rare type of starfish can have up to 50 arms. Their size is about 5 to 10 inches and weight is up to 11 lbs. They have a microscopic eye spot at the end of each arm which helps them to view other sea animals and differentiate between darkness and light. They have tube like feet which help them move quietly.
Amazing facts about Starfish:
- Starfish are brainless.
- Starfish can regenerate a broken arm.
- If they are cut into pieces, every piece can become a new starfish.
Asterina Gibossa, a rare species of starfish, are born male but later they change themselves into females. Also there are some other species of starfish that can change their gender with the change of temperature and it also depends on the availability of food.
They don’t have blood in their body. They have a water vascular system having sea water in it.
A female starfish can lay about 1.3 million eggs at one time, off which lots of eggs are eaten by other marine animals, that is why their population is in control.
They have two stomachs.
Although there are about 1800-2000 species of starfish, most famous or common of them are Bat Star, Red Knobbed Star, Pink sea Star, Carpet sea star and Eleven-armed sea star.