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--- sharks [2021/03/15 02:33]
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+++ sharks [2022/03/25 05:40] (current)
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 ====== Sharks ======
+==== 400-year-old shark ====
+The oldest Greenland shark was found to had lived for nearly 400 years. The sampling was done using the pulse of carbon-14. The Greenland shark grows slowly. [([[http://science.sciencemag.org/content/353/6300/702|Eye lens radiocarbon reveals centuries of longevity in the Greenland shark (Somniosus microcephalus)]])]
 ==== The first comparative study of sharks ====
@@ Line 15: / Line 18: @@
 ==== Shortfin mako ====
 The fastest swimming shark is a shortfin mako, a cheetah in the underwater world. It reaches speeds of 45 miles per hour. Its streamlined body helps minimize water resistance. Another useful biological adaptation of the mako is its ability to maintain a higher body temperature than the surrounding water, so it can channel energy more efficiently into its muscles to achieve higher speeds. Besides, it can leap above the water's surface. [([[https://oceana.org/marine-life/sharks-rays/shortfin-mako-shark|Oceana]])]
+==== No threat to humans ====
+Science films about sharks are often recorded without the use of a protective cage. They posed no threat to humans at the time. [([[https://news.mongabay.com/2021/09/if-you-think-sharks-are-scary-blame-hollywood-new-study-suggests/|Monga Bay]])]
+==== Shark attacks ====
+The highest number of shark attacks on humans has been reported in the United States. However, the most fatalities have occurred in Australia. [([[https://www.floridamuseum.ufl.edu/shark-attacks/yearly-worldwide-summary/|Florida Museum]])]
+==== 500 species of sharks ====
+To date, humans have managed to classify more than 500 species of sharks. [([[https://saveourseas.com/update/5-reasons-why-i-do-what-i-do-shark-geneticists-tale/|Save Our Seas]])]
+==== 2.29 miles ====
+The record shark was at a depth of 2.29 miles. [([[https://www.livescience.com/7049-ocean-depths-shark-free.html|Live Science]])]
+==== Head above water ====
+Hollywood has popularized the image of a shark sticking its head above the water while hunting. In reality, one species does this, which is the man-eating shark. [([[https://moviecultists.com/why-shark-fin-above-water|Movie Cultist]])]
+==== Megalodon ====
+Megalodon is an extinct species of shark that lived 15.9 to 2.6 million years ago. The largest individuals reached lengths of up to 18 meters. [([[https://www.nhm.ac.uk/discover/megalodon--the-truth-about-the-largest-shark-that-ever-lived.html|Natural History Museum]])]
+==== Teeth regrowth ====
+A new tooth grows in place of the lost tooth. Depending on the species, a shark can lose up to 30,000 teeth during its lifetime. [([[https://sharksinfo.com/how-many-teeth-do-sharks-have/|Sharks Info]])]
+==== Play dead ====
+Some shark species have the ability to fall into apparent death. [([[https://www.nationalgeographic.com/pages/article/animals-play-dead-sharks-snakes|National Geographic]])]
+==== Good eyesight ====
+In clear water, sharks can see 10 times better than humans. [([[https://www.bardoptical.com/what-studies-have-revealed-about-shark-eyes/|Bard Optical]])]
+==== Glow in the dark ====
+About 50 different species of sharks glow in the dark. [([[https://news.sky.com/story/scientists-find-three-new-shark-species-that-glow-in-the-dark-12234274|Sky News]])]
+==== Personalities ====
+Scientists have determined that sharks can be introverts or extroverts. [([[https://www.techtimes.com/articles/17025/20141002/sharks-are-extroverts-or-introverts-theyre-more-like-you-than-you-think.htm|Tech Times]])]
+{{tag>fauna science nature}}

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