How shall we three evolve flight?
Trees down or ground up, day or night?
When the proper traits we hold,
When we're warm in climates cold.
That will be ere an era old.
Wings that could have barely flown,
Semilunate carpal bone,
Bony tail with plumed array,
Air-sac-riddled vertebrae,
Furcula within a chest,
Claws with thickness well compressed,
Hands that fold but never tightly,
Metatarsals fastened slightly,
Trenchant pedal ungual two,
In a feathered cauldron stew.
Double, double, toil and try,
Fire burn and cauldron fly.
By the frameshift of my thumbs,
Something winged this way comes.
Fair is fowl and fowl is fair,
Flutter through the fog,