A deep-sea fish with a distinctive appearance has been captured on video walking backwards in the depths of the western Pacific Ocean, challenging long-held beliefs about how fish move. The species, known as Scalicus engyceros, was first described in 1872. It has a body covered in bony plates, large eyes, and long, branched barbels at the tip of its nose that resemble a rake. These features help it navigate and sense its surroundings in the dark, high-pressure environment of the deep sea. The unusual behavior was observed by researchers from Sun Yat-sen University in China, who recorded the fish hundreds of meters below the surface in the South China Sea. Using its rigid pectoral fin rays, the fish was seen moving along the seafloor in a lateral motion, similar to how shrimp or crabs walk. When threatened, it even made small jumps to escape. This kind of movement—particularly the backward "moonwalk" style—had never been documented in any fish before. In addition to its unique walking ability, Scalicus engyceros uses its barbels to both physically touch and chemically detect food or obstacles in its environment. This combination of sensory methods allows it to navigate and survive in the deep sea, where visibility is extremely low. While scientists had already noted the fish’s unusual movement abilities, the recent footage has provided new insights into how it uses its body to move, including the previously unknown backward motion. The discovery underscores how much of the ocean remains unexplored and how many new species and behaviors may still be waiting to be found. The deep sea is one of the last great frontiers on Earth, and each new observation brings us closer to understanding the complexity of life in this mysterious environment.