Julien nods, a motion that's been carefully practiced in an attempt to make it look less silly.

"It's things we needed to resist some invaders. Most of the time this was stuff you'd have to get up close to notice. Lots of people with bird hearts and lungs, or eyes, see. Feet and things didn't start until things got kind of really crazy."

He shifts a wing, unfolding it slightly so he can rearrange it. "...I really needed to be able to fly."