Eagle Flag

Why is there an Eagle eating a Snake on the Mexican flag?

I’m struggling to find a right answer to this. I searched through google and see different stories. Anybody know why is there a Eagle eating a Snake on the Mexican flag?

The Meaning & History of the Mexican Flag – According to Aztec legend the people were wandering in Mexico in search of a sign that their god, Huitzilopochtli, had given them. He commanded them to find a Crested Caracara(the bird) perched on top of a cactus, devouring a snake. After two hundred years of wandering, they found the promised sign on a small island in the Lake Texcoco. Their search and wandering ended and they founded their new capital, Tenochtitl

Rock Flag And Eagle!