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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T H E M E N D O C I N O S H R I K E 21 V O L U M E 6 9 ( 2 0 1 5 ) • N U M B E R 1 Figure 12. The Mendocino shrike on 30 March (a), 6 April (b), 13 April (c), and 17 April (d), showing coloration to lower back, rump, uppertail coverts, and base of the rectrices as it transitioned from formative to frst alternate body feathering and replaced juvenile with formative rectrices. The frst prealternate molt of body feathers progressed slowly through this period and had not completed by the time the bird was last observed, resulting in the lower back and rump becoming increasingly but not entirely grayish. In formative plum - age, the contrast between cinnamon to pinkish-rufous rump and uppertail coverts with browner back (a, b) is not typically found in cristatus Brown Shrikes and favors the infuence of Turkestan or Isabelline Shrikes (Table 1). Note also the reddish juvenile rectrices (a) and the rufous bases to the formative rectrices (d, the latest image taken of the Mendocino shrike in fight). Photographs by Monte Taylor (a), Bruce Pierce (b), Shirley Wilkerson (c), and Patricia Bachetti (d). 12d 12a 12b 12c

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