Neat game, with lots of good ideas. I have to wonder, though, why are the Birdsongs like that? They all feel pretty DnD-y and not something that fits very well, which is strange considering the phenomenal work put into adapting Roles for this world of birds.
Also, I've found a few possible mistakes that may be remnants of a past version of the game: a reference to Modifiers in 'Playing the Game' when the system seems to be roll-under and multiple references to ft measurements in the Birdsong Descriptions, despite even the combat system not wanting to deal with feet and using zones instead.