In the oldest surviving inventory of the collection of the 1st Duke of Alcalá, dated 1588, it appears "...".a boy of black jasper, with one foot on a tortoise, and on his shoulder a goose, two-thirds of the height of his head.". Today this child still serves as a fountain. The attribute on the child's shoulder is no longer the goose mentioned in the 16th century, which has now disappeared and been replaced by a bronze conch shell. For Professor Markus Trunk, although the motif of children with animals is characteristic of fountain figures from antiquity, it is more likely that this piece is a Renaissance recreation following ancient models.