Definitely the raven. The bear's thinking, can I be bothered for 1000 calories? The raven's thinking, yeah, you got teeth but you ain't got wings, and I can see you coming from 165 degrees, so bring it on fuzzball.
No contest!
Of course, the bear could be looking beyond the raven for an altogether more substantial calorie intake... You do seem a touch close there Traveller, didn't my elephant story learn ye nutten' ? -Najinsky