February 29, 1936 51 8. after moves en mass. A very Closely related type) note would be the "recognition" notes, uttered by birds foraging in the open or migrating. These notes probably uttered for constant recognition) the species rather than for determining location. Our Black Phoebe - at the swimming pool - we found in full song for the first time in our experience. My last observation of the bird was February 25th and it was not singing then. The upper banks of the road along the S. facing slope) to canyon have slid in - on to road - greatly this year and the difference