The Yeti crab (Kiwa hirsuta) is a deep-sea crustacean discovered in 2005 near hydrothermal vents in the Pacific Ocean. It lives at depths of around 2,000 meters, where sunlight cannot reach and conditions are extreme. The crab has a pale, almost white body and long claws covered in hair-like filaments, which give it its “yeti” nickname.

Instead of hunting like most crabs, the Yeti crab depends on bacteria that grow on its hairy claws. It waves its arms through mineral-rich vent water to help the bacteria grow, then feeds on them. With very small eyes and limited vision, it relies more on touch and chemical sensing to survive in the dark, high-pressure environment of the deep ocean.

he Black Dragonfish (Idiacanthus atlanticus) is a deep-sea predator known for its long, slender body and sharp, fang-like teeth. It usually lives at depths of 200 to 2,000 meters, where sunlight cannot reach. Its dark black color helps it stay hidden in the deep ocean.

One of its most unique features is its ability to produce bioluminescent light. It has light-producing organs along its body and a small glowing barbel (a thin whisker-like structure) under its chin, which it uses to attract prey. Unlike many deep-sea fish, the Black Dragonfish can see red light, allowing it to hunt using a light color that most other deep-sea creatures cannot detect.

Females are much larger and more fearsome-looking than males. Male Black Dragonfish are smaller, do not have functional teeth, and live much shorter lives. They mainly exist to reproduce.