WASHINGTON - Move over, mammals and birds, and make room for a fish called the opah in the warm-blooded club. Researchers said in the journal Science on Thursday that this deepwater denizen is the ...

Tuna, opah, and billfishes such as marlins and swordfish are among the 0.1% of fish species that are warm-blooded. Evidence by an international team of researchers led by UC San Diego’s Scripps ...

Slow down a little. Many fish maintain a core temperature above ambient. Tuna, for example. Sea turtles also use heat exchangers on their flippers to maintain a higher core body temperature.

One of the fish weighed 180 pounds, 12 ounces, and was recently approved as the world record. More from GrindTV Jerky is making a clean-eating snack comeback 10 surfing life lessons from Jack Viorel ...

For centuries, humans have mythologized the bluefin tuna, an elite, warm-blooded fish that can traverse the Atlantic basin in less than a month and a half and grow to weigh three-quarters of a ton.

WASHINGTON (Reuters) - The hot question of whether dinosaurs were warm-blooded like birds and mammals or cold blooded like reptiles, fish and amphibians finally has a good answer. Dinosaurs, for ...

Approximately 99.9% of fish and shark species are 'cold-blooded', meaning their body tissues generally match the temperature of the water they swim in -- but researchers have just discovered the ...

Muscular and ferocious, the bluefin tuna has long been a top choice of anglers and chefs, who prize the fight and the flavor of its warm-blooded deep red flesh. But in recent decades this apex ...

Basking sharks can maintain a body temperature that is higher than their environment, putting them among a small group of fish species that are warm-blooded. Out of around 35,000 species of fish ...

Mammals are defined as warm-blooded vertebrates with hair who produce milk to feed their young. Mammals also have more developed brains than other types of animals. Humans are mammals.