Ravens in Hollywood

While I was toweling off after my shower, I could hear ra’ak, ra’ak outside, very near - must have been in the pines. Going on 10:00 a.m. Overcast, moderate temps. Never saw them though. There is no view from the bathroom window to speak of. Do they make rounds? Do they always stop by LaBrea and Sunset in the morning? Why? Earlier there had been crows flocking around the billboard, and I took a picture for purposes of comparison.