The White-head 
75 
The notes of (14) to (16) are clear whistles, varying in 
number from three upwards, about four quavers a second. 
They are almost staccato, are not always clear, being at times 
vocalized as in (14), when it sounds as though the bird had a 
stone in his mouth. The first short note is vocalized tu (short u 
as in but). There is a curious and irregular variation in this 
phrase; it may open as in (14), or the first four notes may be 
<SY9- 
omitted; and at times the last d will be sung d flat; or the last 
two notes may be sung flat, as in (15) ; or there may be a succes¬ 
sion of flat and natural pairs as in (16). These semitone varia¬ 
tions are evidently under control, as the bird appears to sing 
one or other at will, and whichever is sung is clear and unhesi¬ 
tating. The themes as in (14) and (17) are reminiscent of the 
fan tail. The theme of (17) is a clear, rapid whistle of triplets, 
followed by the common enharmonic notes of (2). 
The phrase of (18) may be sung singly at intervals, or 
repeated twice, three times, or more. If three times, as in (19), 
