[Animals. She has to pause and think about that, glancing up at the sky.] ...no. The soul of an animal would be far too weak and the creature's life would likely be in danger. Furthermore, attaining consent from an animal would be impossible, as far as I am aware.

[She looks back at Sanji, amazed that he's still talking to her.] I suppose my definition was rather curt. Although I must feed on what most humans consider to be their soul, doing so has no permanent repercussions on them... [A pause.] ...so long I am in-control of my powers at the time.