User blog comment:Razhel/What is Your Favorite Guild Besides FT?/@comment-89.242.91.230-20130627173337/@comment-4829046-20130628055448

Also there is the fact that so far we have only seen flying Dragons in the main story. According to Zirconis and the picture, there should be land and water variants as well.

Also using 400 years all the time makes it very difficult to gauge the time line. Cause look

http://www.mangareader.net/fairy-tail/301/18