Dromedary

The dromedary is a fast riding-camel. The UPDV uses "young female camel" at Jeremiah 2:23 and "young camels" at Isaiah 60:6 for the Hebrew בִּכְרָה/בֶּכֶר root-family; it renders "camels" at Isaiah 66:20 (a different Hebrew term, כִּרְכָּרָה); and it renders two additional passages as "swift steeds" supplying Solomon's stables and the royal post-system of Persia.

The young camels of Midian

Isaiah's oracle of Zion's incoming glory pictures the desert routes from the south thick with camels: "The multitude of camels will cover you, the young camels of Midian and Ephah; all those from Sheba will come; they will bring gold and frankincense, and will proclaim the good news of the praises of Yahweh" (Isa 60:6).

Swift steeds in royal service

The same family of fast riding-animals shows up in the logistics of two royal courts. Solomon's officers fed the king's mounts on rotation: "Barley also and straw for the horses and swift steeds they brought to the place where [the officers] were, every man according to his charge" (1Ki 4:28). And Ahasuerus' counter-edict in the book of Esther travels by the same kind of fast animal: "And he wrote in the name of King Ahasuerus, and sealed it with the king's ring, and sent letters by posts on horseback, riding on swift steeds that were used in the king's service, bred of the stud" (Esth 8:10).