Ahuizotl (mythology) VS Iara (mythology)

Ahuizotl (mythology)
The ahuizotl (from the Classical Nahuatl: āhuitzotl for "spiny aquatic thing", a.k.a. "water dog") is a legendary creature in Aztec mythology. It is said to lure people to their deaths. The creature was taken as a mascot by the ruler of the same name, and was said to be a "friend of the rain gods".The conquistador Hernán Cortés once reported to the King of Castile that one of his men had been killed by an ahuizotl.
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Iara (mythology)
Iara, also spelled Uiara or Yara (Portuguese pronunciation: [iˈjaɾɐ], [iˈaɾɐ], [ˈjaɾɐ], [wiˈjaɾɐ], [ujˈjaɾɐ]) or Mãe das Águas ([ˈmɐ̃j dɐˈz aɣwɐs], "mother of the waters"), is a figure from Brazilian mythology based on ancient Tupi and Guaraní mythology. The word derives from Old Tupi yîara = y ("water") + îara ("lord; lady") = "lady of the lake" (water queen). Depending on the oral tradition and the context of the story, she can be seen either as a water nymph, a siren, or a beautiful mermaid that lives in the rivers of the Amazon Basin.