On a related note, Ishgard is the only place that breeds (or bred) transport chocobos. At the beginning of 1.0, there was a chocobo plague and the demand for healthy chocobos could not be met even within Ishgard, thus their export stopped, resulting in a shortage that lasted well into the game's release. The plague eventually subsided and adventurers were once again allowed to rent chocobos and get one from their grand company.