I like the Kraikirans, buncha smart emo ravens xD But I do have nitpick - the [i]compressed[/i] helium in the scales would not aid flight whatsoever. The more you compress it, the denser it gets and is going to "float" less. Ideally you'd want vacuum in there. also it'd be kind of hard to get into their system as it's so light it would just stick in the upper levels of atmosphere above the oxygen and float out into space and it doesn't really form any compounds that could be eaten.