Also known as deep-sea anglerfish or lanternfish, it is a unique fish species that lives in the deep sea. Known for its unique hunting method, it usually has a glowing bait to attract prey. The body structure adapts to the dark environment of the deep sea, and the eyes are relatively small because there is almost no light at such depths. On the contrary, they usually have a glowing organ on their body that attracts small fish or other organisms as food. Large in size, some species can reach a body length of over 1 meter. Rough skin, usually dark brown or black in color, helps them hide in the deep sea. The mouth is large, the teeth are sharp, and it can quickly capture and swallow prey.

It is a peculiar fish that lives in the deep sea, named after its transparent head and unique tubular eyes. Their eyes can rotate, not only to gaze upwards, but also to look forward, helping them capture prey in the pitch black deep-sea environment. Small in size, usually only about ten centimeters long, feeding on small fish and jellyfish. The eyes contain green pigment, which can filter out sunlight shining from the ocean surface, making it easier for them to detect glowing jellyfish and other organisms. Their heads are surrounded by a transparent liquid shield to protect their eyes. Discovered for the first time in 1939, the pipefish remains an important subject of research for marine biologists to this day.

Also known as the hammerhead shark, it is named after its unique flat head and widely distributed eyes, mouth, and nose. It is a deep-sea fish that lives on the seabed. It can usually grow up to about 4 meters in length and reach a width of the head. The shape of their heads helps them search for food in the sandy soil on the seabed, such as small fish and crustaceans. It is also known for its unique hunting strategy, which utilizes the shape of its head to detect and perceive prey. Despite its unique appearance, hammerhead sharks are not particularly dangerous and are usually not aggressive towards humans. Due to overfishing and habitat destruction, this species is already facing the threat of extinction in some areas.