Well, I'm not too familiar with the Chocobo lore but I can probably guess what most of them do and wiki the rest. Or just ask someone who knows all about that mod
I believe they have different abilities, for example the blue ones swim really fast I think. not sure on that though, haven't gone beyond yellow because the only female I had died during a test...
Pr0, it's got tons of dungeons, monsters,weapons, and new bosses to get lots of enjoyment from. I even made a "barbecue" pit. ask shadow or Fwi about it.