San Diego Scientists Discover Why Some Sharks Glow

Some sharks glow deep under water and it turns out the reason has to do with aiding communication between sharks, according to San Diego researchers.

5 photos
Gruber et al.
Top: Fluorescent light image of a female swell shark. Bottom: White light image of a female swell shark.
American Museum of Natural History scientist David Gruber using a special "shark-eye" camera.
Gruber et al.
A look at a swell shark in its natural habitat under white light, natural light and high-intensity blue light (top to bottom).
Gruber et al.
A female chain catshark under fluorescent and white light.
J. Sparks, D. Gruber, and V. Pieribone
A biofluorescent swell shark.
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