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Why (only) some Sharks are Warm-Blooded

Sharks have the reputation of being cold-blooded killers that will attack and try to eat just about anything. But in reality, they are actually a lot pickier than many people realize - Attacks on humans are very very rare. But even the "cold-blooded" portion isn't even true - at least not when it comes to Great Whites. Because they are in fact part of a small group of sharks that can elevate their body temperatures above the water temperature - effectively becoming warm-blooded. Here's how they do it. Sources: http://www.sharksavers.org/en/educati... https://www.researchgate.net/publicat... http://www.elasmo-research.org/educat... http://jeb.biologists.org/content/205... https://seaworld.org/animal-info/anim... http://minerva.union.edu/linthicw/con... https://fishionary.fisheries.org/tag/... Music by Jay Man Tracks used: http://ourmusicbox.com/ms_song/Murder... http://ourmusicbox.com/ms_song/Forgot... http://ourmusicbox.com/ms_song/Time-W... http://ourmusicbox.com/ms_song/Storm-... http://ourmusicbox.com/ms_song/dance-... http://ourmusicbox.com/ms_song/Swing-... http://ourmusicbox.com/ms_song/Past-R... http://ourmusicbox.com/ms_song/Quirky... http://ourmusicbox.com/ms_song/Watchi... http://ourmusicbox.com/ms_song/Up-to-... http://ourmusicbox.com/ms_song/Prankster http://ourmusicbox.com/ms_song/Goodby... Thanks for watching. https://creativecommons.org/licenses/...