Remsen, J.V. 1978 Blue-throated Hummingbird Lampornis clemenciae Three Rivers [cont] Jan.19 it seemed to be nearly twice the length of a nearby [cont] Annals Hummingbird and at least as long as a nearby Oregon Junco. In flight the tail seemed proportionally longer than that of other hummers in Calif. The rapid opening and closing of the tail feathers highlighted the white tail tips on the outer tail feathers. The call note, heard about every 10 minutes, was a series of very high-pitched "peeek!" 's, a whistle with a slight upward inflection, usually 2-4 given in a series with intervals of about 1 second. Also given was a lower-pitched "phew!" whistle when chasing other birds from the feeder. It chased all other birds from the hummingbird feeder, including a sapsucker and a Nuttall's Woodpecker. The ♀ Rivoli's Hummingbird is the only other species with which the Blue-throated could be confused; Rivoli's has a green tail (less extensively spotted), lacks the pair of white facial stripes, and is not an even gray underneath.