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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 512 described and 23 undescribed species in eight orders. The families and genera within the orders are listed in ...
The size at birth has been reported to be 61–80 cm (2.00–2.62 ft), though observations of free-swimming juveniles as small as 57 cm (1.87 ft) long in the eastern Pacific suggest that birth size varies geographically. [14] Juvenile sharks remain in shallow water to avoid predation by larger adults. [4]
The growth rate for milk sharks off Chennai have been calculated as 10 cm (3.9 in) in the first year, 9 cm (3.5 in) in the second year, 7 cm (2.8 in) in the third year, 6 cm (2.4 in) in the fourth year, 5 cm (2.0 in) in the fifth year, and 3–4 cm (1.2–1.6 in) per year from then on. [23]
Fossil shark tooth (size over 9 cm or 3.5 inches) ... The average number of fatalities worldwide per year between 2001 and 2006 from unprovoked shark attacks is 4.3 ...
English: The size and growth of the whale shark (Rhincodon typus), represented by various individuals reported in the literature.A small 55 centimetres (22 in) pup, a 5.62 metres (18.4 ft) juvenile, a generic 9 metres (30 ft) young adult, a large 12.1 metres (40 ft) adult, and an exceptionally large adult with a precaudal length of 15 metres (49 ft).
A giant shark that was known as a megalodon use to terrorize the underwater world. Although the enormous sharks didn't make the evolutionary cut, researchers believe they still had a big impact on ...
LeeBeth, a 14-foot, 2,600-pound great white shark, is outfitted with a GPS transmitter and was last tracked about 20 miles south of Gulfport, MS. LeeBeth, a 30-year-old great white shark, has ...
These are the world’s shark hotspots. Shark attacks on humans are very, very rare. ... This time of year, the shark-related news stories start to circle. ... is brimful of beaches and is ...