Board Thread:Consensus Track/@comment-38502514-20190216075013/@comment-34115-20190221182136

I think there's a perfectly reasonable line to draw between a jutsu that permanently integrates the user with the physical body of another biological being and can only be used on biological bodies; and a transformation justu that is automatically undone unless the user continually exerts chakra to continue the transformation and can be used to transform into inanimate non-biological objects.

;) Unless of course you feel like coming up with a list of all the instances a ninja has transformed into an animal, plant, or inanimate object and adding a species listing to characters. e.g. For Kiba Inuzuka, "Species: Human, Wolf".