Bio Adaption

you call fourth the nature and the power stored in the blood of a beast to adapt one of its natural organs. 

 after consuming the blood of the beast intended to adapt you can have one of it's organs as if it is yours for the duration and as long as you maintain concentration on this spell,  the organ you adapt must be applicable to your current form, for example you can adapt the wings of a bird as your hands change and grow some feather allowing you to fly or you grow some gills of a fish on your neck allowing yo to breath under water.