This mythical creature from the folklore of the Tewa people is a water guardian serpent:

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The avanyu is a water guardian serpent from the mythology of the Tewa people, who are Native American tribes from the southwestern United States. It is believed to live in bodies of water such as rivers or lakes and is said to have the power to bring both rain and fertility to crops. The other options - gila monster, phoenix, dragon, and copperhead - are not associated with the folklore of the Tewa people.

This Mythical Creature from the Folklore of the Tewa People