I don't SEE any horses! - The Lore Team Responds!

[Deltara]

First addon expansion called "Horsefeathers" will go into more detail about the war between the chocobos and horses. This war has become known as the Steed War.

[Conradus]

This war has become known as the Steed War.

"Mrs. Peel, we're needed."

[Kyri]

KFH ?????? eww

[Laughlyn]

Chocobo AND Unicorn Breeding Can we haz?

i smell a wicked exprementailst. lol

[AreeyaJaidee]

So future expansions "have" an entire planets worth of possibilities:

"So while it may seem like there are no living horses in the currently accessible areas of Eorzea, there are in fact horses when you consider the entire planet of Hydaelyn.

Hyur and Lalafell travelled to Eorzea long ago and it is because their ancestors utilized horses as mounts that you can see remnants of this in their speech and crests."

Interesting.
FFXIV is probably a larger scaled project than we all assumed.