Since Deino's intellectual capabilities are decreased by the constant use of headbutt, a second head grows in its place, however this head is also blind. But as the saying goes, 'two heads are better than one!'. Zweilous grows stronger steadily by a highly rich in protein diet. It can head very well, and it is quite fast, despite its shortened legs and bigger belly. The Winglets it sports are made of strong but light fur. The rest of this pokemon's body is covered in blue fur, but when it evolves into Hydreigon it becomes sharp, needle like fur that's very fine. The fur on this pokemon is so fine they cover the scales very thinly, looking almost invisible.
zweilous..hmm zwei is german for 2 but lous?
'Since Deino's intellectual capabilities are decreased by the constant use of headbutt...'
Now its evolved into an awesome DRAGON very nice ^^