Mantis shrimp may look cute, but they can punch stronger than bullets, quickly killing their prey.

Christmas tree sea worms have a unique shape and often live in coral reefs. The body size of Christmas tree worms is not too large with an average length of only about 4cm. They are among the few best known arthropod marine worms in the world.

The coconut octopus has tentacles that look as if they are surrounded by gems. Its strange name is based on the habit of collecting coconut shells for shelter.

The snake-tailed starfish stands out with its bright colors and has five arms or appendages attached to a circle on its body.

The leaf sea dragon looks like a dragon in myths. Their color and leaf-like appendages help them easily camouflage among algae-covered rocks.

When flying gurnards are excited, they will expand their “wings” with bright and eye-catching blue edges.

Flower hat jelly only lives for a few months so encountering it is very rare. This marine creature is characterized by shiny tentacles that can curl up and cling tightly to the jellyfish cap when not in use.

Banggai cardinal fish are only found in small areas around Banggai island and Sulawesi island in Indonesia.

Sea lilies live in both shallow waters and areas as deep as 9,000 meters. Their characteristic feature is a mouth at the top surrounded by arms.

The crown-of-thorns starfish is one of the largest sea stars in the world. It is commonly seen throughout the Indian and Pacific Oceans./.