Many people think that this is an alien creature because its appearance is so unique, but do not know that this creature’s hunting behavior is also very cruel. (Source Boredomtherapy)

The sail jellyfish, whose scientific name is Velella velella, is a strange carnivore in the ocean. They are also called “good sailors” because of their ability to rely on the wind and float freely on the sea surface. (Source Boredomtherapy)

The prey of sail jellyfish is usually plankton and fish eggs. (Source Boredomtherapy)

Sail jellyfish hunt using tentacles containing venom-injecting cnidocysts, also called nematocysts. (Source Boredomtherapy)

It attacks its prey by stinging it, injecting poison that paralyzes the prey, no longer able to resist, and can only stand still and wait for the sail jellyfish to digest. (Source Boredomtherapy)

Sail jellyfish do not live alone, they often move in groups of millions of individuals. (Source Boredomtherapy)

A genus of hydrozoa that floats freely in open waters, sail jellyfish have an average length of about 10cm and are often seen as light blue in color, easily blending into seawater. (Source Boredomtherapy)

Sail jellyfish have a transparent “fin” that resembles a piece of glass on their body. This fin acts like a sail, helping them move on the sea surface thanks to wind and water flow. (Source Boredomtherapy)

Although it carries a poison that can cause paralysis, sail jellyfish are harmless to humans. (Source Boredomtherapy)

Occasionally people also catch transparent colored sail jellyfish like this. (Source Boredomtherapy)

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During storms, millions of sail jellyfish can be seen being washed ashore by the waves, creating a spectacular sight like this. (Source Boredomtherapy)