They are! I recently had to make peace with a family of them, one of whose fledglings I had inadvertently upset by getting too close with a camera.

Fortunately, ravens are smart enough to recognize the combination of repeated food offerings, and a demurral to repeat the initial rudeness, as earnest of good intent - walking out the door with my camera no longer provokes alarm calls and surveillance overflights. Catbirds, not so much - I pissed off one of those back when there was snow on the ground, and I suspect he'd still quite happily rip my lungs out if he could.