|Copper sheet, Copper chain|
"In the northern part of Cordoba, especially around Quilinos, people spwak of a sow harnessed with chains which commonly makes its presence known in the hours of the night. Those living close to the railroad station maintain that the sow slides on the tracks, and others assured us that it is not unusual for the sow to run along the telegraph wires, producing a deafening racket with its "chains." As yet, nobody has caught a glimpse of the animal, for as soon as you look for it, it vanishes unaccountably."
Borges ads that the Sow harnessed in Chains (Chancha con cadenas) also sometimes goes by Tin Pig (chancho de lata)