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(19)

[[underlined]] Diglossa [[/underlined]], May 20, 1960, IV

[[pink marking]]
uttered by a [[male symbol]] flying very rapidly after another bird, probably attacking.  This latter R was not followed by song.

The [[female symbol]]'s were so skulking that we saw relatively little of their behaviour.  We did, however, observe one extreme alarm reaction by one [[female symbol]], and heard a lot of alarm notes by many others.

Every once in a while, when we walked past a particular dense bit of hedge, we would hear a bird utter one or a few single "Hoop" notes.  There were quite like the notes uttered by [[female symbol]] [[underlined]] aterrima [[/underlined]] when disturbed (see notes of Aug. 4, 1959, p.6).  Obviously provoked by our presence.  I shall call these notes "[[female symbol]] AlCN's".  Unfortunately we could not see the [[female symbol]]'s uttering these single AlCN's;  and so I don't know if they were accompanied by any special movements or postures.

Later on, a dog came down the road, barking quite loudly and steadily.  As soon as it started to bark, a [[female symbol]] Diglossa in a dense hedge began to utter many AlCN's.  Most of the AlCN's she uttered were [[underlined]] double [[/underlined]]: "Hoop hoop" arranged in series [[?communica]]: _ _  _ _   _ _  _ _   _ _  _ _

While she uttered these notes, the [[female symbol]] moved slowly down the hedge still keeping well hidden.  Then, after the dog had left, David and I found that we could provoke the [[female symbol]] into even more frantic bursts of AlCN's by squeaking at her.  She also tended to come toward us as we squeaked, so that we got some fairly good views of her.  We squeaked at her off and on for quite a long time, and as a result we can summarize her alarm reactions as follows.

The doublet AlCN's are higher intensity than the single AlCN's.  She uttered almost nothing but doublets when we were actually squeaking, but gradually declined into single notes when we 
[[/pink marking]]