Gulf of Tadjoura, Djibouti

A whale shark’s mouth can extend to up to 1.5 meters wide, with between 300 and 350 rows of tiny teeth.

Whale sharks (Rhincodon typus) are slow-moving, filter-feeding sharks found in tropical and warm oceans, and are the largest non-mammalian vertebrates on the planet. The species originated some 60 million years ago, and individuals normally have a lifespan of around 70 years.

Currently, however, whale sharks are listed as a vulnerable species. They come under particular threat from pollution and strikes by boat propellers, and are also hunted for their fins and flesh.

The sharks feed by drifting with their capacious mouths open, drawing in plankton, fish, and small crustaceans. Foreign objects, such as plastic, can also be drawn into the shark’s digestive system, causing harm.