North American Birds

VOLUME 69 No1 2016

A Quarterly Journal of Ornithological Record Published by the American Birding Association. The mission of the journal is to provide a complete overview of the changing panorama of our continent’s birdlife.

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Page 18 of 179

17 V O L U M E 6 9 ( 2 0 1 5 ) • N U M B E R 1 T H E M E N D O C I N O S H R I K E ages and video clips of the Mendocino shrike allowed assessment and progress of its fight- feather molt (Figures 6-7). By 13 March, p3- p5 were noted to be missing by one observer (Jeff Petit) and by 21 March, p4 and p5 were growing equally at about 50% of full length and p3 about 25% of full length (Figure 6a). A replacement node occurring synchronously at two adjacent feathers (p4 and p5) is of inter - est and indicates that the node's position may be fuid within a defned area along the alar tract, as found in other birds (Pyle 2013a). By 27 March, replacement of primaries had pro - ceeded bidirectionally to p3 and p6, which were growing at about 80% and 70%, respec - tively, p2 had dropped, and p1 and p7-p10 remained as old feathers (Figure 6b). By 16 April, p1 was still old, p2-p6 were fully grown, p7 was 80% grown, p8 was 30% grown, and p9-p10 had dropped (Figure 6b). The old in - ner primary coverts had been retained, and the outer three or four were being replaced concurrent with the outer primaries (cf. Fig - ure 13). A rough calculation of feather growth rates based on molt scores, along with total length of all primaries (529 mm, the mean of one each of Red-backed, Turkestan, and Brown Shrike specimens measured by Pyle), 10c 10e 10d Continued on page 20

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