The sea star is a strange creature.
They belong to the group of echinoderms divided into 5 groups which are sea star, snake stars, sea cucumbers, sea urchins and sea lilies. There are about 2000 species and most common are the sea star with 5 arms but have species that can have up to 20 arms.
Their propagation process is varied in nature and a little special. Most are single-sex, but there are also same-sex, i.e. hermaphrodites. They have genitals on each leg and the single-sex syringe spraying sperm or eggs, if the eggs are not fertilized, they can sometimes undergo so-called Virgin birth. There are also species that can split into 2 and let new arms grow out where it is missing, even if it takes some time.
It has eyes at the end of each arm.
The sea star eat meat and scavengers and is not as harmless as you might think. The tips of the arms have taste and olfactory organs, and each arm has little of its own life. If an arm smells a good smell, it becomes dominant and the rest of the sea star may kindly come along, they have two stomachs that they can turn inside out, for example, if they pry up a clam, they turn one of their stomach into the clam, spray out stomach fluid that dissolves the prey and begins to eat.
The sea star's mouth sits on the underside and on the opposite side they release their feces.
On the underside of the sea star sits thousands of small legs with suction cups. It is really strong and meanders about, for example, a clam and breaks it up. With all the small legs, it looks like it's floating forward when it moves in any direction.
A Sea star is very sensitive to touch, light and temperature changes. They have no brain but have a very complicated nerve system and an intricate water vessel system for transport, breathing and movement.
It is believed that the sea star can be 35 years old, but since you can not age determine on the size, you do not know completely. The size of the sea star is determined by food, quantity and quality.
The sea star is the vacuum cleaner of the sea and keeps the bottom clean from, among other things, like dead animals, and are hugely important to the ecosystem.
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