The Ayawa, the Thunders, are four brother culture-heroes who shaped the ancestral landscape. Coming up the Milk River and passing through the Water Door, they drove the sacred Yuruparí trumpets before them like ploughs, and where the instruments cut the earth the valleys and waterfalls of the world were formed. As thunder beings they belong to the sky and to the season of storms, and as bearers of the He instruments they carry the voice and bones of the ancestors into the human world, linking the making of the land to the origin of the flutes that sound at initiation. They move through the same myth cycle as the hero Warimi, and Barasana narrators treat the four as a single acting body even while distinguishing them.