The park, roughly 125 kilometres east of Quito, is famed for dramatic Andean vistas, and the race took place between the wetlands at altitudes nearing 4500 metres.
A llama named Rayo McQueen carried six-year-old Eric Javier Chicaiza to a win in his category. His mother, Fatima Guanotuna, said the animal was a gift to the family when the boy was born, and the two have always been close.
Nine-year-old Ibeth Santafe, three times a winner in past races, was sombre after finishing third. But she came out a winner in a llama-training contest, showing mastery over her beast.