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The legs and outer toe bear long aerodynamic feathers similar to those of terran birds. They can be moved independently of the limbs they are attached to, and when not in use they are usually folded upwards. Argusraptors and ophreys have the "wing toe" raised off the ground for monodactyl running and preventing the long feathers from dragging on the ground, respectively. In some flighted species, the wings are slotted to allow for thermal gliding.
The legs and outer toe bear long aerodynamic feathers similar to those of terran birds. They can be moved independently of the limbs they are attached to, and when not in use they are usually folded upwards. Argusraptors and ophreys have the "wing toe" raised off the ground for monodactyl running and preventing the long feathers from dragging on the ground, respectively. In some flighted species, the wings are slotted to allow for thermal gliding.


There are two patagia on the leading edge of the limb, which streamline it for gliding or flight and obscure the anatomy underneath. One stretches from the ankle to the knee, while the other stretches from the knee to the base of the neck.
There are two patagia on the leading edge of the limb, which streamline it for gliding or flight and obscure the anatomy underneath. One stretches from the ankle to the knee, while the other stretches from the knee to the neck.


Flight-capable species have large keels derived from the front protrusion of their cephalopelvis, which supports their massive wing muscles. Their hips are also more flexible, as necessitated by the use of their legs as wings, though this comes at the cost that the protrusion which supports the pillar-erect posture of other species is tilted upwards, therefore requiring them to use more energy to stand upright.
Flight-capable species have large keels derived from the front protrusion of their cephalopelvis, which supports their massive wing muscles. Their hips are also more flexible, as necessitated by the use of their legs as wings, though this comes at the cost that the protrusion which supports the pillar-erect posture of other species is tilted upwards, therefore requiring them to use more energy to stand upright.