- Order: Saurischia
- Suborder: Bird Feet
- Infraorder: Bird Wyvern
- Superfamily: Eared Bird Wyvern
- Family: Kut-Ku
Although the Blue Yian Kut-Ku are stronger than the normal variation, they are still pretty low in the food chain. Though still weak, Blue Yian Kut-Ku are known to occasionally scare away Yian Kut-Ku. When not being preyed upon by large predators, Blue Yian Kut-Ku feed on insects, honey, and nuts. Just like Yian Kut-Ku, its biggest threat is Yian Garuga.
Blue Kut-Ku possess the same adaptations as the Yian Kut-Ku. The only real differences between the two are their color and fighting styles. Blue Yian Kut-Ku have a blue-colored shell that is more resistant to fire. Unlike Yian Kut-Ku, they have a stronger fire sac and better aerial abilities. Blue Yian Kut-Ku are also physically stronger than Yian Kut-Ku, while enraged.
Some rare individuals have greatly enlarged orange beaks used in deadly scooping and throwing attacks, more vivid blue coloring, increased flying abilities, and a uniquely developed flame sac that is used to create an unusual rolling fireball possibly mixed with mucus. It is unknown if these individual traits are extra mutations or traits of old age. In the Val Habar region the Blue Yian Kut-Ku have four toes instead of three.
Blue Yian Kut-Ku are very cautious and wary creatures that are easily startled by sudden loud noises. When undisturbed, these monsters spend their day foraging for food, but if confronted they will flare out their ears and spread their wings while making loud shrieks.