Viewing page 6 of 114

Cyanerpes, Nov. 5, 1957, II. 6
upwards (sometimes almost vertically), head more or less pulled back, and neck more or less stretched upward ―i.e. in postures quite reminiscent of typical BU. This whole performance looked quite high intensity; so perhaps the G is as high intensity as, or even higher than, the Wh, only containing a stronger escape element.

[[image]] Extreme "retreat BU" by ♀ with G.

I also saw some more typical "friendly" BU's with Wh, directed by the ♀ at the ♂ [[underline]] Cyanerpes [[/underline]]. These were with slight CR; but much less than most of the corresponding performances by the ♂.
The ♂ has CR almost constantly while I am watching him and/or any other bird is nearby.

Cyanerpes, I  November 6, 1957 Barro Colorado

I have now put the 2 birds in the outside aviary. They attract another ♂, in full breeding plumage, who just sits for hours, looking at them, with constant CR. No trace of song.
Please note that the language and terminology used in this collection reflects the context and culture of the time of its creation, and may include culturally sensitive information. As an historical document, its contents may be at odds with contemporary views and terminology. The information within this collection does not reflect the views of the Smithsonian Institution, but is available in its original form to facilitate research. For questions or comments regarding sensitive content, access, and use related to this collection, please contact