My working morning has been enlivened by a pair of Carrion Crows advertising their territory ownership repeatedly from atop the building opposite my office. They use a peculiar call for this, which has a a honking horn quality, drawn out and without the 'r' sound present in many crow calls. It carries far, and is made while the bird carries out a self-advertising display, by bending forward exaggeratedly, with the tail fanned and, as they make the call they stretch forward and back on a graceful curve. I photographed the pair yesterday nearby (above), with one of them doing the advertising call. This is the call from a Xenocanto recording by Matthias Feuersenger.
More Carrion Crow calls from the blog 'Echoes from Nature" here.