Hitchhiker or bouncer?

I just love this picture of a Red-winged Blackbird, perched on the back of a Red-tailed Hawk, that someone sent me recently. I don't know if the blackbird is just hitching a ride or if he is running the hawk out of town. I suspect it's the latter. I've seen this happen many times, actually, as smaller birds protect their territory or nests against predator birds, but someone (I don't know who) was really lucky to get this shot. You have to admire the courage, or chutzpah, in this David and Goliath encounter.
I went out yesterday looking for Horned Larks because I needed an infusion of the promise of spring. The weather was great and I found a half dozen of them in some vacant farmland. I also came across a pair of large and healthy-looking, Rough-legged Hawks doing all sorts of aerial rough-housing with each other. They must have got a rush out of the spring air also. They kept a close eye on me, though, and I never got close enough for a photo...same with the Horned Larks, unfortunately. Oh well, next time.
BtheB