Common ravens, among the largest of the passerine (perching) birds, are a success story throughout the Northern Hemisphere, living from the high arctic and high mountains to coastal regions and hot deserts.   In some areas they have adapted well to human habitation (a pair frequently nests on a window ledge at my University campus) but in other places they are wild and wary.   Everywhere, ravens are social and highly intelligent birds.
          Ravens often harass (sometimes playfully) soaring red-tailed hawks; one image below shows a fairly peaceful interaction between an adult red-tail and a raven. They circled together for several minutes, ascending in a thermal, with no obvious agression by either one.
          These photos were taken in California (the desert, near Escondido , in Palo Alto, and in Riverside) in Anchorage, Alaska, and at Bosque del Apache refuge in New Mexico.

• Canon 10D, 1D Mk. II, 1D4, or 7D2; 100-400 IS zoom lens at 400 mm, 500 mm IS lens plus 2X converter, or 800 mm IS lens plus 1.4X converter, some with fill-in flash (2004, 2005, 2011, 2012, 2015-2018)