User blog comment:BastionMonk/No feathers in JPIV/@comment-1791057-20130322165614/@comment-1791057-20130322233744

Well, they could introduce another species of Raptor that we haven't seen before. I know that some fans have been hoping to see Archaeopteryx in the series at some time, or maybe Microraptor acting sort of in the Compies' stead.

As for the images, the ones I linked to are very recommendable.