Metavian Plane Variations

While I've been silently working on my Cargon project, I felt like drawing up variations of my living planes - the Metavians (Combination of "Metal" and "Avian").
My Metavians were developed from my Cargons but are bird based instead of dragon based, hybridizing between the two species is exceedingly rare due to their different lifestyles.
The text document that I have on my Cargons will explain everything, it'll eventually be translated into a series of study ref sheets.

The first one is a quadruped plane like Aria
Second one is a biped like Vector and Velvia
Then the third and fourth one are anthros.

artwork and species (c) me