Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head.

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Shark-bitten orcas in the Northeastern Pacific could be a new population of killer whale

Researcher Accidentally Discovers Shark’s Amazing Power To Regenerate Its Sabotaged Fin

A shark regenerated an entire hole in its fin in under a year and scientists got the amazing transformation on camera

Shark kills rise to more than 100 million per year—despite antifinning laws

Shark's Torn Fin Seen Regenerated a Year Later in an Incredible First

Shark fear: Just when you thought it was safe to get back in the water...

See a mob of seals save their pups from a shark in Planet Earth III

Perseverance Mars rover spots 'shark fin' and 'crab claw' rocks on Red Planet (photo)

Shark shock: Scientists discover filter-feeding basking sharks are warm-bodied like great whites

Important Shark And Ray Areas Delineated In The Mediterranean And Black Seas

Here's Why The World's First Eco-Certified Shark Fishery Closed Down

Parasitic Eels Found Inside The Heart of a Shark, And We Will Never Unsee The Pics

Zombie worms devour shark teeth that fall to the ocean floor

Whale shark seen bottom feeding for the first time

The most widespread shark species have had relatively little variation in the shape of their jaws over millions of years, with the most variable jaws found in deep-sea sharks, according to a recent study.

Jaw shapes of 90 shark species show: Evolution driven by habitat

‘A Bit Spooky’: The New Shark Species With Bright, White Eyes

The Devil Is In The Details: New Demon Shark Discovered

The Shark Nursery: Uncovering the Mystery of Live Birth in Cartilaginous Fish

Police Arrest Man Accused Of Beating Shark With A Hammer