Sources : Zedrosis

Pliny the Elder [1st century CE] (Natural History, Book 9, 2): There is an enormous peninsula in the Red Sea called Cadara, the projection of which forms a vast bay... In this tranquil retreat particularly the creatures grow to a huge motionless bulk. The admirals of the fleets of Alexander the Great have stated that the Gedrosi who live by the river Arabis make the doorways in their houses out of the monsters' jaws and use their bones for roof-beams, many of them having been found that were 60 feet long. - [Rackham translation]

Thomas of Cantimpré [circa 1200-1272 CE] (Liber de natura rerum, Marine monsters 6.56): The Zedrosi are marine animals; Pliny testifies that they inhabit Arabia. The bones of these beasts are so large, that doors in houses and palaces and huts, or other necessary structures, are conveniently cut from them. For some are found to be forty cubits in length. These beasts signify the saints in the Church, from whose bones, that is, by virtues, the holy universal Church is decorated, strengthened and built. - [Badke translation/paraphrase]