OLDEST RING- BILLED GULL CHICK, July 22, 1955. General comments. 
1 . Attack . Like the Franklin's Gull chicks. 
2. Escape. Like adults and the Franklin's Gull chicks, 
■ Lmny auuLi w' .juiiffr .smiw* 
3. Alert posture . Like adults and the Franklin's Gull chicks. 
k. Panic defense . Gaping and pecking. Much like Franklin's Gull chicks; 
but this bird seems to get much less upset, (will just sit quietly, very 
often, when I pick it up and dangle it). 
5. Alarm Cal 11 . Single high intensity Distress Call note. Less polysyllabic 
than some, but each syllable very distinct. Only heard it occasionally, 
when I pick the bird up. 
6. Whistle complex . Very common sound; (I have difficulty provoking the 
other calls, but this one is always with us). Sound much like the Whistle 
of the young Franklin's Gulls. Characteristic, perhaps, with Hunched . 
Not too uncommon with Head-bobbing . Occurs with Head-tossing ; (first noted 
around July 19th). Occasionally accompanied by single and most peculiar 
Honks . Apparently by-products. Sometimes, probably very rarely, by Ruffle , 
Aggressive Whistle complex. This rather baffles me. Hunched posture, 
or, more commonly, Head-down Hunch . Never (?) any Head-tossing or Head-bobbing. 
Very often precedes attack.. Wings held out or drooping before attack, tail 
markedly raised. Sometimes accompanied by Ruffle T but not usually immediate- 
ly before attack. 
When Whistle accompanies Head-tossing, it usually accompanies the upward 
movement, 'When Whistle accompanies Head-bobbing, it also, apparently, usually 
accompanies the upward movement, but there is great variation. 
Some Whistles given from Erect posture; but I am not sure exactly how 
definite this pattern is. May only be first phase of Head-bobbing, without 
any second phase. 
7. Juvenile Long Call Note complex . This is obviously a higher intensity 
pattern tha.n the Whistle. Less aggressive than the Juvenile Pumping Notes 
or some Whistles, This is often the initial greeting sound, (less often than 
in the Franklin's Gulls), usually followed by less aggressive Whistles as the 1 
second stage of greeting. 
Generally occurs in much the same situations as the Juvenile Long Call 
Notes of the Franklin's Gulls; but I can't say anything about it as an aerial 
or landing pattern. Sometimes accompanies "exercising" of the wings . 
Perhaps most characteristic with Head -bobbing . Usually, apparently, on 
the upbeat. Not uncommon from Erect , (i.e. top phase of Head-bobbing). 
Very rare or non-existent, in pure form, with other postures. 
Can intergrade with both Whistles and ^uvenile Pumping Notes. 
No sign of an organized Long Call as yet. 
8. Juvenile Pumping Note complex . Sounds much like the corresponding call 
of the young Franklin's Gulls; (but it is more like the Whistle, and less 
like the Juvenile Long Call Note). Obviously very aggressive. Higher intens- 
ity than the Whistle. 
Perhaps characteristic with Head— down Hunch . Sometimes S qua t . Wings 
held out or drooped, tail markedly raised. Sometimes accompanied by Ruf tie. ; 
but less often, now at least, than I expected. / t would £* 
Have not noticed it with immediate pre-attack postures; but 
