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Sharks are found in all seas. They generally do not live in fresh water, with a few exceptions such as the bull shark and the river shark which can swim both in seawater and freshwater. [102] Sharks are common down to depths of 2,000 metres (7,000 ft), and some live even deeper, but they are almost entirely absent below 3,000 metres (10,000 ft).
The first shark-like chondrichthyans appeared in the oceans 400 million years ago, [1] developing into the crown group of sharks by the Early Jurassic. [2] Listed below are extant species of shark. Sharks are spread across 556 described and 23 undescribed species in eight orders. The families and genera within the orders are listed in ...
Format/layout of article, oceanic whitetip shark is probably the best shark article right now, that is the standard that we want all articles to follow. Article names, shark article names when common name is used should be sentence case - all with lower case letters unless it starts a sentence or phrase, or is a proper noun ie name of country ...
The Bahamas have had 34 unprovoked shark attacks dating back to 1580, according to the Florida Museum's International Shark Attack File. This makes the Bahamas the ninth-highest of all the tracked ...
Researchers at the Marine Biological Association of the UK and the University of Exeter studied ten small groups of cat sharks And now, a new study says sharks have personalities as well. Yes, sharks.
In total, the researchers uncovered about 10,000 documented sightings of basking sharks in a large region of the United States.
A shark, also called a "selachimorph", can be described as all of the following: Animal – multicellular, eukaryotic organism of the kingdom Animalia or Metazoa. An animal's body plan eventually becomes fixed as it develops, although some types of animal undergo a process of metamorphosis later on in their life.
The great white shark was one of the species originally described by Carl Linnaeus in his 1758 10th edition of Systema Naturae, in which it was identified as an amphibian and assigned the scientific name Squalus carcharias, Squalus being the genus that he placed all sharks in. [24] By the 1810s, it was recognized that the shark should be placed ...