Alaska species accounts, part 1, v4220
Page 467
Image from the Biodiversity Heritage Library. Contributed by Museum of Vertebrate Zoology, University of California, Berkeley. | www.biodiversitylibrary.org
Transcription
Holmes R. 1961 Encounters passerines 3. 7 June Barrow, Alaska The display seen again near Voth's area. The birds were 1st noticed in a territorial pursuit, where 2 birds were chasing a third. The indiv then veered off + The other two kept together + finally landed. The 8 went into the posture described yesterday with Tail cocked + wings spread at a great then horizontal L. The 4 then took flight, the 8 following close behind as they darted forth. The 8 would set his wings at 20 above the horizontal + glide for a short time. He would fly a glide just behind (usually slightly below) the 4. All this activity was accompanied by a quiver-like trill, similar to the aerial song. The bull was given in short phrases of 2-10 sec. duration. Whenever the birds landed, the 8 went into posture. On 2 such cases, he did not have time to raise his wings (just tail was cocked) before the 4 took flight. He would fly 30 to 200' land + then take off The air again after a few seconds. This went on for up to 2 min. - before they flew out of sight. The head & is held up at about a 45° L + not horizontal while in the air. 8 June - Two birds seem displaying aerially. They came close together + it looked like a chase would ensue. One followed the other + they both landed. One went into the courtship