00:03This wild-looking creature is one of the largest shark species known, called the basking shark,
00:08or what is sometimes referred to as the filter-feeding shark.
00:11While it might look outlandish, it has an even more outlandish quality according to marine biologists.
00:17Unlike 99.9% of other shark and fish species, it's not entirely cold-blooded.
00:22In the last half century, it was discovered that some sharks, most notably the Great White,
00:26had some body parts that were warmer than the surrounding ocean water,
00:30meaning they have been categorized as regionally endothermic, or partially warm-blooded.
00:34Experts long believed this was likely due to their apex predator status,
00:38but now that same partial warm-bloodedness has been observed in the basking shark, confounding marine biologists.
00:45According to the researchers, they believed the warm-bloodedness was a trait that helped higher food chain creatures achieve their
00:50status,
00:51but add, quote,
00:51Now we have found a species that grazes on tiny plankton, but also shares those rather uncommon regional endotherm features,
00:58so we might have to adjust our assumptions about the advantages of such physiological innovations for these animals.
01:04The researchers dissected a couple of the sharks in the hopes of figuring out how it all works,
01:08discovering compact muscles around the shark's heart,
01:11something they say allows them to increase their blood pressure and maintain higher temperatures in other muscular tissue.
01:21export to theatoch an environmental chiar où problema et cetera.
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