The Histories · 3.102

Others however of the Indians are on the borders of the city of Caspatyros and the country of Pactyïke, dwelling towards the North of the other Indians; and they have a manner of living nearly the same as that of the Bactrians: these are the most warlike of the Indians, and these are they who make expeditions for the gold. For in the parts where they live it is desert on account of the sand; and in this desert and sandy tract are produced ants, which are in size smaller than dogs but larger than foxes, for there are some of them kept at the residence of the king of Persia, which are caught here. These ants then make their dwelling under ground and carry up the sand just in the same manner as the ants found in the land of the Hellenes, which they themselves also very much resemble in form; and the sand which is brought up contains gold. To obtain this sand the Indians make expeditions…

Herodotus of Halicarnassus · trans. G. C. Macaulay, 1890
Source edition
Passage preview. Read in context for the complete text, notes and references.