Sight Rec... Report Please fill out as accurately as possible. Include only those details of which you are certain and only those observed in the field; leave blank details not observed. Attach any additional comments or details on separate sheets. Please print or type Species Black-throated Blue Warbler Date(s) Oct. 27, 1973 Location south point (Point Reyes Nat. Seashore) Fishing cave - residence area County Marin State Calif Elevation 100 Observer Van Remsen Number of birds 1 Time of Day ~1600 Light conditions excellent Distance to bird 15-40' Optical equipment 10x50 binocs Length of time observed 10 minutes Sex male Plumage (e.g. Breeding) breeding Overall appearance and relative size A warbler with strikingly contrasting underparts and upperparts Bill typical warbler size-shape. Crown and forehead Blue Nape Blue Face Black below eye Eye dark Throat black Breast and sides upper breast and sides black. Lower breast immaculate white Belly and flanks belly immaculate white. Flanks irregularly black Undertail coverts white Back Blue Wings Dark with white stripe on leading edge of wing below shoulder and rectangular white spot in bases of primaries; both marks extremely conspicuous Underwings not seen Rump Blue Uppertail coverts Blue