Robert A. Hamilton has more than 20 years of experience as a full-time biological consultant in southern California. He is a well-rounded naturalist and recognized authority on the status, distribution, and identification of birds in California and Baja California. Among his publications are two standard references describing aspects of the state's avi­fauna: The Birds of Orange County: Status & Distribution and Rare Birds of California. Read his Curriculum Vitae.


  • Federal Permit No. TE-799557 to survey for California Gnatcatchers and Southwestern Willow Flycatchers
  • Federal Bird Banding Subpermit No. 20431
  • State Scientific Collecting Permit No. SC-001107
  • State Memorandum of Understanding to use playback of vocalizations to survey for Cactus Wrens, California Gnatcatchers, and Southwestern Willow Flycatchers