Look, here comes a blobfish! This thrilling deep-sea fish was voted the world's ugliest animal by the Ugly Animal Preservation Society. But its jelly-like skin looks much more natural at 900 meters.

The ocean is an average of 3.2km deep. Humans know of about 245,000 marine species. The most common sea animals are those without a backbone, such as jellyfish and shrimp. There are thousands of ...