Warm-blooded opah fish flaps its fins – video

Footage from Science magazine, released on Thursday, shows the first warm-blooded fish to be discovered. The opah, found off the US, Australia and other countries, swims using its pectoral muscles to generate warmth. The fish's internal system has been compared to a car-radiator system, similar to endothermic mammals and birds that can maintain their body temperature, regardless of their environment Continue reading...