with 30 ft booming live all high up never coming down lots. Of course the birds on the nesting right feed some but do a lot of diving. Often directly before a big (pre meditated) dive the bird would quicken the call note (perceptibly). The boom itself at a distance of 20 ft seems weak while the metallic note is strong, yet it's is a resonating vibration in the boom that carries farther. The boom has resonance. The note is sharp but shut in. Hence at a distance one hears only booms and no notes. I stood on the cliff from 4:30 to 5:30 each two week was bother watching the bird, every where I one could hear a nearly continuous booming. I hope later to find a nest and see for