From a ballet of white-tip reef sharks to a cardinal fish releasing freshly hatched babies from its mouth, these underwater ...

The image took Honorable Mention in the Cold Water category of the 13th Annual Ocean ... underwater. Visit Underwater Photography Guide for a full gallery of winners. (Click to expand images.) ...

The underwater mountains ... help identify this cluster of sea urchins as the species Dermechinus horridus. The scientists can't determine a new species based on photos and videos alone.

Thousands of marine species from microscopic zooplankton to the largest cetaceans rely on sound for survival and many have evolved unique oral and aural adaptations. Understanding them better could ...