"Even crocodile blood is super-powered. All vertebrates, including humans, have a special protein in their red blood cells called "hemoglobin" that transports oxygen from our lungs to the rest of our body. Crocodile hemoglobin is like a Boeing 747 Dreamlifter; it can carry more oxygen than any other animal. In fact, researchers have been able to use this oxygen-rich croc blood to help human beings survive dangerous and complicated heart transplants."