Bonaparte* s, June 20, 1955* X 
The unmated adult is still here, and so are a few first-year birds, 
but the great bulk of the birds seems to have gone. Got very little 
today. 
The unmated adult is still behaving as before; but much duller, as 
there are fewer birds around to encounter or to display to. He seems 
to have formed or re-formed his connection with a first-year bird. The 
latter stays around in his neighborhood, calls to him when he flies over- 
head, and goes into a U when he flies very near. 
Notice that the Alarm Call of flying birds is often uttered with 
apparently closed bill. The adult gave continuous monosyllabic Alarm 
Notes as he circled around me, and repeatedly made shallow Swoops toward 
me and then moved away in shallow w Flying** Soars. Thus the Alarm Call 
must contain an appreciable element of attack drive. 
Saw both adult and first-year bird give repeated series of Long 
Call Notes from completely relaxed, almost hunched, postures. This was 
definitely not a display posture. 
The voice of the adult, at moderate intensities at least, is defin- 
itely less buz2.y, more of a scream, than that of his first-year ^mate” « 
The difference is slight, how ever . 
