The magüi is a massive majá snake the size of a palm tree with scales of overlapping brown and green and a distinctive pair of small curling horns on each side of its head. The serpent's jaws can open wide to devour prey of prodigious size, and it has been known to snatch and devour whole oxen or horses that wander too near to their lairs and fishermen avoid the lakes and rivers where they live for fear of their jaws, though they never attack humans. A magüi grows to 30 feet long and weighs over 2,000 pounds.