Several species of the Mackerel Sharks, including the Great White Shark and Mako Sharks, have a circulatory system that retains metabolic heat. While otherwise cold-blooded, this enables them to maintain body heat as much as 25° Fahrenheit (14° Celsius) warmer than the surrounding water. It’s almost like being warm blooded. The advantages are significant, enabling them to extend their range significantly beyond what they would otherwise tolerate.

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amber said:

	cool pic i love it
	report abuse vote down vote up

June 02, 2008 | url
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