For some reason, Familiar Spirits who take the form of Butterflies always take a form similar to that of the Birdwing Butterfly. These have bodies that are from 4 to 5 inches in length and a wingspan of 12 to 14 inches. And unlike normal butterflies, they have claws on their legs that can deal damage to foes. Giant Butterflies can fly at a minimum speed of twice the listed movement rate given in the stat block. Giant Butterflies grant their bonded spell casters a bonus of +2 to all First Aid skill rolls. Additionally, any spells or items or effects that transform or change the caster’s physical form in some manner will automatically have up to double the normal duration.