Remson, J.V. 1975 Bewick's Swan Olor bewickii Jan. 15 Red Bluff area, Tehama Co, Calif: 1 ad. seen on Hog Lake, a small lake on n. side of hwy. 36 about 8 mi. NE of Red Bluff, where it had been found on Jan. 13 by Steve Laymon of Red Bluff. Overall size same as Whistling Swan but slightly longer-necked, and thicker-headed than an average Whistling. Bill pattern and shape best indicated by diagram below, a tracing of the original sketch I made at the time of the observation. We identified it as a Bewick's rather than Whooper for the following reasons: (1) bill shape -- definitely a concavely curved culmen like Whistling Swan -- not straight like Trumpeter and, apparently, Whooper (2) truncation of yellow bill coloration -- sharply defined, vertical demarcation rather than slanted as in Whooper. This meant that the nostril, which was apparently at the upper edge of the black projection at the distal border of the yellow, was not well within the black area of the bill, as shown by Delacour for Whooper. (3) culmen black for entire length -- in MVZ specimens of Whooper, the yellow patches meet