Most sharks only have five gill slits, but the sevengill shark evolved with seven. Scientists still cannot explain exactly ...

Sharks have between 5 and 7 gill slits located on the side of their head. Sharks have long captured our fascination with their sleek bodies, sharp teeth, and predatory success. Yet, beneath this ...

Hammerhead sharks are intriguing creatures, and when they begin some of their deepest dives, they take a deep breath and close their gills. At least, that's what new research seems to suggest. The ...