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[[underline]] Cyanerpes [[/underline]]. June 23, 1960, V.  86[[circled]]

ion, or more probably, produced when the sex drive is relatively stronger, and the drives relatively weaker, than in St patterns without Belly-fluffing. Belly-fluffing, in other words, may be taken as an indication of sex. 

(It may also be significant that the [[male symbol]] was apparently always silent when he approached the [[female symbol]] in an St with Belly-fluffing. The Bzz's seem to be an indication or expression of hostility.)

None of these St & Belly-fluffing approaches were accompanied by Q of any sort.

The [[female symbol]] usually ignored these approaches. Only once did she turn toward the [[male symbol]] and open her bill. I couldn't hear any sound when she opened her bill, but it looked very much as if she might be uttering SR. She remained fluffed, in an H or semi-H posture, during this bill-opening. The [[male symbol]] responded by retreating at once.

The [[female symbol]] eventually went to sleep, head tucked under scapulars!!! She must have been exhausted by all the excitement of being captured, etc. (So I cannot interpret her previous fluffing and ruffling as the result of a relatively strong escape drive  She may just have been preparing to go to sleep)

After the [[female symbol]] woke up, both birds flew around some more. Not very excited. Occasionally feeding. The [[male symbol]] tended to assume a very weak St Posture, without BL and/or tail-raising ("TU") each time he approached the [[female symbol]] or the [[female symbol]] approached him. Only once did the [[female symbol]] assume a weak St Posture (without other ritualized components) when the [[male symbol]] approached her. All these St's were silent.
I stopped observing about 9:15.
I must say that the occurrence of all these display patterns today definitely confirmed my previous experiences of the motivation of these displays.