Variations: Anaconda, Boi-úna, Cobra Grande, Cobra-grande, Eunectes murinus, Mae-d’agua, Mae-do-rio, Mboia-açu (“Large Snake”), Mboiúna; Mru-kra-o (Kayapo); Vai-bogo (Desana)
Boiúna or Cobra Grande is one of the most widespread and polymorphic myths of the Amazon basin. The name is applied to concepts and creatures ranging from a goddess of the water to a synonym of the green anaconda (Eunectes murinus).
In lingua geral the term boi denotes a snake (such as jiboia, the boa constrictor). Una means black. Thus a boiúna or mboiúna is a black snake, a name it shares with the mussurana. Its other name of cobra grande (“big snake”) is even less descriptive.
But a cobra grande is nothing if not big. It grows up to two hundred meters long and ten meters wide. Its enormous eyes, 0.5 to 1 m apart, glow like searchlights, with colors including orange-yellow and blue. Sometimes it has large, sharp canines on its lower jaw that stick out through holes in its upper jaw like horns. It has a powerful stench that can make people dizzy, and it makes loud rumbling sounds. Its massive bulk easily hides in the underwater holes it digs. Sometimes it appears as a ghost ship, a steamboat or a sailboat.
Boiúna can be found at the bottom of streams, rivers, lakes, and ponds, but it usually avoids the rainforest and dry land. When water levels fall in the dry season boiúnas slither out in search of deeper water, gouging out new stream channels and troughs. Its mere presence in the water can impregnate women.
When it swims a boiúna leaves a distinctive, huge, v-shaped bow wave. It protects the fish of its waters. It has a magnetic power that allows it to immobilize ships in the middle of the river, and release them at its discretion; inexplicable boat malfunctions can be ascribed to a meddling boiúna.[…]
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