Yutu

Yutu is the tinamou, and it sits in the dark cloud series between the toad and the llama. The tinamou is a plump ground-dwelling bird of the Andes that flies badly and rarely, and whose response to danger is to freeze and rely on not being seen rather than to run or take off.

That behaviour is what the shape is read as showing. The dark form is squat and low, and the bird it names is a squat low bird that stays put. The Andean dark constellations tend to be read this way, by posture and by habit rather than by outline alone, which is a different practice from the Greek one of joining points into a figure.

In some recorded versions of the sequence there are two tinamou shapes rather than one, and the naming varies between communities, which is what one expects of a system transmitted orally over a large area with strong local variation.

The bird is also food and is hunted, and several of the dark animals are: the tinamou, the llama and, in a different sense, the fox that takes the llamas. The set is not a bestiary of the impressive. It is the working fauna of the high Andes, put in the sky in the order that the year needs them, which is a different principle from a sky of heroes and monsters.

The Andean dark constellations are best understood as one object rather than five. Taken separately each is a resemblance and not a very strong one; taken together they are a sequence with a fixed order and a use, and the order carries the information.

The set as recorded runs Machacuay the serpent, Hanp'atu the toad, Yutu the tinamou, Yacana the llama with its offspring, and Atoq the fox, positioned consecutively along the Milky Way from roughly Scutum through to Crux and Centaurus. Their successive appearance above the horizon through the year tracks the wet season, the growing season and the herding cycle.

There is a further layer. The Milky Way itself is Mayu, the celestial river, and it is understood as continuous with the terrestrial water: it runs down at one end of the sky, passes under the earth, and comes back up. The dark animals are on the riverbank. The llama coming down at midnight to drink is not a separate story bolted on but the same picture continued.

The whole thing amounts to a hydrological and calendrical model expressed as animals on a river, in a place where water arrives seasonally and its arrival matters more than anything else. It is a very economical piece of engineering.