A lion would probably defeat a jaguar in a fight because it is much larger. While a jaguar can weigh up to 220 pounds, an African lion can weigh up to 420 pounds. Asian lions are even larger, weighing up to 500 pounds.
Both lions and jaguars have powerful, muscular bodies, sharp claws and long fangs. Both are adapted to hunting large mammals, though they eat smaller animals as well, and lions are also scavengers. Jaguars have the most powerful jaws of any cat and can even bite through turtles' shells. Both species are the top predators in their food chains, but their environments do not overlap. Jaguars live in Central and South America, while lions live in Africa and Asia.