Because the menagerie of animals in FFXI was such an exotic mix of fantastic beasts.
Like Hares, Crabs, Sheep, Bees, Wasps, Birds, Beetles, Spiders, Fish, Tigers, and
There is an underlying rule in fantasy fiction concerning immersion. It is that no fantasy world completely without grounding in the real world can create a plausible sense of suspension of disbelief.
Hey, if a blue and white zebra striped raptor fits into the environment, that'll be just great. I'm a little skeptical of that though, given hunters usually blend in with their environments, and cold-blooded raptors probably won't live in a tundra.
Normally I wouldn't argue with this, but reread the codex entry for the Raptor. It states that it's method of hunting requires distraction and luring. Camouflage would actually be detrimental, as the listing states that they hunt "in holts and copses"- in the woods- and that one will lure the prey in a chase to exhaust the quarry, when the partner will ambush the fatigued quarry. Therefore, in order to keep the prey's attention on the lure, it must be visible at all times, even while obscured by tree and shrubbery. Meanwhile, while holding absolutely still, behind low shrubbery to break the stripe pattern up, it's markings might appear to some as shadows on a large whitish object (such as a rock, or birch), as diffuse daytime shadows in sunny weather are often bluish in hue, and it's white body is likely to pick up the reflective light sources of whatever it is near (remember: scales).
Also, consider the zebra. When in tall grass, it's stripes render it nigh invisible to a lion in the distance because the lion is colorblind. Perhaps it's usual prey is colorblind. Given the information on it's hunting habits, however, it's usual prey is probably something that is territorial and large enough (or in a group large enough) to respond to predation by attempting to chase the predator away- not whatever the unfortunate furry thing that strayed into it's line of sight is. It makes some threats, gets their attention, and runs. The prey (possibly an alpha male) attempts to chase the Raptor away, while the raptor lures him out of the range of his herd and right into his partner's ambush.
[EDIT:] Almost forgot I was going to mention naming. There is also a tradition in some fantasy works (dating back, I THINK to The Hobbit) where the text of the world has been translated into the language we are reading for the sake of us readers. Sometimes it is noted in the text, other times it is assumed. What that means, is since there is no "English" in many fantasy settings, the use of "Common Speech" is then used as a substitute for whatever language the work is published in. This is because the reader is assumed to be reading in a language that is "common" to them. So in that spirit, since it looks like an antelope, even if the word for it in the fantasy setting might be something different, in the "translation" for the sake of the readers, the word antelope is used. Edited, Oct 11th 2009 11:26am by CrownDefender