Most Pseudo Wyvern in Monster Hunter are similar to cats in behavior, while their appearance is more reptilian. Because their wings are mostly used as legs, the muscles controlling their flight seem to be weaker and smaller than they are in Flying Wyvern. For this reason, most of them are weak fliers, with the exception of the Barioth. In Monster Hunter, the Pseudo Wyvern are more primitive than Flying Wyverns and among them are the ancestors of the Flying Wyvern. The ancestor of all Flying Wyverns is the Pseudo Wyvern Wyvernrex.