Of course, part of the business of hawks is raiding the nests of crows and ravens, so this kind of harassment is understandable.
As always, click to enlarge:
Canon 400mm f/4.0 DO IS Diffractive Optics lens at f/8.0. (Too expensive, overrated, has weird bokeh at times, needs to be stopped down, lacks a focus preset ring, but aside from that a decent lens I s’pose. I got a good deal on a used copy then I later sold it for the same price, so I guess that’s Even Steven. Canon’s 300mm 2.8 IS design from the 1990’s remains superior. Canon would have been a lot better off investing resources devoted to the Diffractive Optics program on something else, it would seem…)