This little bird is free for a limited time, but as well as putting it up for archive I also decided to convert one of the versions (the "calm" version with the most bones) to FBX for people who don't know how/want to do all that shit.

I recommend setting the fbx scale to 100, then setting the armature scale back to 1 to ensure the overall scale matches whatever avatar you're trying to attach it to.
Default physbone set to angular limits with a 25 angle and .8 or .9 immobility seems to work well.

Might try my hand at recreating the other textures myself, let me know if you'd like to be pinged for those if I end up doing them.

model comes in at about 6k tris

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PW: birb