There is no chance that it is anyone other than Bofur.
With regard to the butterflies, I asked at TORN whether anyone who has seen the film can confirm whether that scene (as well as Bilbo naming Sting) is in. The poster "Bombadil" claims that both are in, but he can't point to his source. I'm afraid I don't believe that he knows what he is talking about, so as far as I am concerned, it is still an open question.
Hopefully Al will get in to the Irish premier tomorrow and let us know for sure, if we don't know by then. Otherwise, I'll ask Telemachos at TORC, who also is supposed to see it tomorrow.
ETA: Bomby has now given a more specific answer that still doesn't give a source, but has more specific information. I am still not certain, but it sounds like he may well know what he is talking about.
"Spirits in the shape of hawks and eagles flew ever to and from his halls; and their eyes could see to the depths of the seas, and pierce the hidden caverns beneath the world."