What is the story behind the eagle on the Mexican flag?

The eagle on the Mexican flag represents a significant Aztec legend. According to myth, the Aztecs were instructed by their god Huitzilopochtli to settle where they saw an eagle perched on a cactus, eating a serpent. This vision led them to found Tenochtitlán, which is now Mexico City. The symbolism of the eagle, cactus, and serpent reflects themes of strength, resilience, and the triumph of good over evil.