Starfish | How to fold an Origami Starfish | Simple Origami For Kids
Starfish or sea stars are star-shaped echinoderms belonging to the class Asteroidea. Common usage frequently finds these names being also applied to ophiuroids, which are correctly referred to as brittle stars or basket stars. Starfish are also known as Asteroids due to being in the class Asteroidea. About 1,500 species of starfish occur on the seabed in all the world's oceans, from the tropics to frigid polar waters. They are found from the intertidal zone down to abyssal depths, 6,000 m (20,000 ft) below the surface.
Starfish are marine invertebrates. They typically have a central disc and usually five arms, though some species have a larger number of arms. The aboral or upper surface may be smooth, granular or spiny, and is covered with overlapping plates. Many species are brightly coloured in various shades of red or orange, while others are blue, grey or brown. Starfish have tube feet operated by a hydraulic system and a mouth at the centre of the oral or lower surface. They are opportunistic feeders and are mostly predators on benthic invertebrates. Several species have specialized feeding behaviours including eversion of their stomachs and suspension feeding. They have complex life cycles and can reproduce both sexually and asexually. Most can regenerate damaged parts or lost arms and they can shed arms as a means of defense. The Asteroidea occupy several significant ecological roles. Starfish, such as the ochre sea star (Pisaster ochraceus) and the reef sea star (Stichaster australis), have become widely known as examples of the keystone species concept in ecology. The tropical crown-of-thorns starfish (Acanthaster planci) is a voracious predator of coral throughout the Indo-Pacific region, and the northern Pacific sea star is considered to be one of the world's 100 worst invasive species.
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Starfish is a carnivorous animal. It mainly preys on slow-moving marine creatures such as shellfish, sea urchins, crabs and sea anemones. Starfish is a class of the phylum Echinoderm. On the sand or reef under the sea. Starfish is a greedy carnivore. Although their activities cannot be as flexible and swift as sharks, their main prey objects are some slow-moving marine animals, such as shellfish, sea urchins, crabs and sea anemones. When it hunts, it often adopts a slow and circuitous strategy, slowly approaching the prey, using the tube feet on the wrist to catch the prey and enveloping the whole body, spit out the stomach pouch from the mouth, and use digestive enzymes to dissolve the prey in its body. Be absorbed by it.
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