839 total votes
Shark

Shark

Sharks are a group of 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. Modern sharks are classified within the clade Selachimorpha and are the sister group to the rays. However, the term "shark" has also been used for extinct members of the subclass Elasmobranchii outside the Selachimorpha, such as Cladoselache and Xenacanthus, as well as other Chondrichthyes such as the holocephalid eugenedontidans. Under this broader definition, the earliest known sharks date back to more than 420 million years ago. Acanthodians are often referred to as "spiny sharks"; though they ... more on Wikipedia

lists about Shark

These Tips Will Help You Survive A Shark Attack 20.2k views Sharks are one of the most feared creatures that inhabit planet Earth. The worst thing that many swimmers and surfers can im...
12 Fascinating Facts Most People Don't Know About Shark Feeding Frenzies 2.3k views Shark hunts are often portrayed as vicious blood baths of extreme proportions. Luckily, that's pretty far from the truth. Sh...
These Incredible Abilities Give Sharks A Sixth (And Seventh) Sense 2.5k views When most people hear the word “shark,” it conjures up images of the ravenous great white menace from Steven Spielberg’s 197...

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