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Warm-blooded fishes swim faster and farther than cold-blooded counterparts

Some species of fish possess a unique physiological characteristic a web of arteries and veins lying very close together that enables them to raise their internal temperatures higher than that of the water surrounding them. Species possessing the ability to warm their core a process called endotherm are able to swim two and a half times faster than those whose body temperature doesn't change. In addition, these species, which include some sharks and tunas, can also swim twice as far ranges comparable to those of warm-blooded animals such as penguins and other marine mammals. The cost of moving faster and farther is high so there has to be an ecological reason that outweighs the physiological expenditure. These endothermic fishes are putting a lot more energy into each unit of movement than their cold-blooded counterparts are. In fact, the estimated cost of transport is twice as high, but in return they're getting benefits from that increased swimming speed and wider range of migration. The two taxonomic groups diverged more than 450 million years ago, and their common ancestor was most likely cold-blooded.

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