First, a special note about L.A. County: As counties go, Los Angeles is quite remarkable. Yes, there are a huge number of CBC’s in LA county (12!); but also, in all of the United States, San Diego County is the only other that can lay claim to pelagic birds, montane birds, and desert birds, all residing comfortably in their own ecosystems. Yes, seeing a Verdin, a LeConte’s Thrasher, and a Mountain Bluebird on one LA County CBC; then turning around the next day and seeing a Parasitic Jeager, a Black Oystercatcher, and a Lewis’ Woodpecker on another LA County CBC, is entirely possible - although not easy!