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To more successfully hunt fast and agile prey such as sea lions, the great white has adapted to maintain a body temperature warmer than the surrounding water. One of these adaptations is a "rete mirabile" (Latin for "wonderful net"). This close web-like structure of veins and arteries, located along each lateral side of the shark, conserves heat by warming the cooler arterial blood with the venous blood that has been warmed by the working muscles. This keeps certain parts of the body (particularly the stomach) at temperatures up to 14 °C (25 °F) above that of the surrounding water, while the heart and gills remain at sea temperature. When conserving energy the core body temperature can drop to match the surroundings. A great white shark's success in raising its core temperature is an example of gigantothermy. Therefore, the great white shark can be considered an endothermic poikilotherm because its body temperature is not constant but is internally regulated.
reply to post by Agit8dChop
Australia... where the animals on land rival the animals in the water for being the most dangerous predators.
Just see if you can name three land based predators in Australia. Just three would do. Thanks.
Seems like a lot of folk are not getting the point that the tracking device was never near the surface for a week, which would preclude all sea mammals.
What about another Great White SharK? Sharks get in feeding frenzies and attack one another. And GW sharks have core temperatures, particularly in the stomach, higher than the surrounding water:
The only other possibility I can imagine is a giant squid, but they are completely cold blooded, which would rule them out.
I watched a doco on this event last night. They concluded it was another great white shark. A giant squids mouth does not swallow whole. It crushed into paste.
If the tag was external on the shark, is it possible that another creature took only 1 bite at the shark, and doing so, ate the tag with it?
It doesn't have to be something that eat the whole shark.