Sea stars
Sea star are animals that are part of the echinoderm group, with more than a thousand species in the world. They are found from shallow areas to deeper areas. They manage to regenerate body parts and use this strategy to survive.
Its locomotion is done through ambulacral feet, which are like tubes with suction cups at the end, which stretches when filled with water and contracts when emptying. These feet are in rows on the underside of the animal's body. The entire system is hydrovascular, and in addition to being responsible for all nutrient transport, it also makes locomotion. That's why we shouldn't take them out of the water, otherwise they dry out and air enters their body, which can lead to death.
Choco chip sea star - Protoreaster nodosus
Species of tropical environment that inhabits the Indian and Pacific Oceans, lives associated with the sea bottom, in sandy, muddy, rocky substrates, and can also be found in coral reefs. It feeds preferentially on corals, sea sponges and sea urchins, but it can also feed on algae, biofilms and other dead animals. It reaches a maximum size of 20 cm, and has black bumps on its body used to chase away predators, due to its menacing appearance. It is a species that indicates the quality of reefs.
Red knob sea star - Protoreaster linckii
Found in the western Indian Ocean, off the coast of Africa and Madagascar, north of India and Sri Lanka. It lives alone or in groups on sandy or muddy bottoms, reaching depths of up to 100 m. They can reach a maximum size of 30 cm, are nocturnal and have a body covered with red spines. They are omnivorous, feeding on everything that has organic origin.