Earlier I posted from memory an article I remembered. I found the article in the "June 19th POL update" and would like to share it.
***
Chocobo Breeds:
{Destrier}
These knightly mounts were bred in San d'Oria. They underwent training that allowed them to bear the weight of heavy armor and withstand the shock of cavalry charges. Destriers were characterized by their large, jet-black bodies and thick, powerful legs. With the decline of lance combat and improvements to ranged weaponry, destriers lost their place in battle to the faster coursers. These days, there are no remaining purebred destriers, but it is possible to see their proud bloodlines occasionally reemerge in the birth of rare, black chocobos.
{Courser}
The courser is a larger-than-average chocobo and is the most common breed found in the Kingdom of San d'Oria. They are characterized by their streamlined bodies, and long, graceful legs. They were originally bred for scouting duties, but their adoption into the military was accompanied by a general acceptance of the courser as an everyday mount. On extremely rare occasions, a red-colored courser will be born.
{Palfrey}
The mid-sized palfreys were bred to withstand the searing air and blazing heat of the desert. They are mainly raised in the Republic of Bastok and on Zepwell Island. With a relatively gentle demeanor, these chocobos are suited for those with who lack advanced riding skills. Palfreys are known to come in both blue and yellow.
{Jennet}
This breed of chocobo has been magically reduced in size to provide mounts for the diminutive Tarutaru. They have short legs when compared to other breeds, but like the Tarutaru themselves, jennets are capable of maintaining a rapid pace. Due to a request from the southern Mithra wishing to blend into the jungle, there are some jennets that can be found in a shade of green.
{Rounsey}
With its huge population of adventurers, Jeuno boasts more frequent use of chocobos than any other nation. The main type of chocobo to be found in the duchy is the mid-sized rounsey. The pride of the famous trainer Brutus and his family, the rounsey is the result of a lengthy breeding program involving wild chocobos. This program has produced a robust mount of somewhat unpredictable temperament that is suited for long, punishing treks.
***
This is from POL and one of the FFXI updates so it is accurate and dependable (hopefully lol). Make of it what you like :-)