10-31-2022, 02:29 PM
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Senior Member
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Join Date: Mar 2017
Location: ABQ, New Mexico
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Most sharks that we recognize as sharks have 5 gills. This one has 6. Called a Sixgill Shark this variety is much older than Great Whites or Tigers or Hammerheads. Why did nature go from 6 to 5 gills? Maybe at the time there was more Oxygen in the water (hundreds of millions of years ago) and it was just an evolutionary change. The way things are changing with our oceans warming up - that means less Oxygen in the water. Will nature adjust? Hope so.
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