Scientists have captured rare footage of a sperm whale giving birth, offering a window into the large mammals' behavior.

Scientists studying the sperm whales that live around the Caribbean island of Dominica have described for the first time the basic elements of how they might be talking to each other, in an effort that could one day help better protect them.

(CNN) - Glowing green sharks swim in the dark depths of the ocean thanks to an entirely different kind of biofluorescence than other marine animals. Previously, researchers knew that some shark species produce a green glow that is only visible to other sharks. Researchers discovered that previously unknown small-molecule metabolites are the cause of the green glow. The two types of sharks in the study have two skin tones, light and dark. During their research, Gruber and his colleagues realized the molecule responsible for the fluorescence was only in the light skin.