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.

Issue link: http://nab.aba.org/i/629070

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Red-backed Shrike Turkestan Shrike Isabelline Shrike Brown Shrike Brown Shrike Mendocino Shrike Character L. collurio L. phoenicuroides L. isabellinus isabellinus L. cristatus cristatus L. cristatus lucionensis TABLE 1a: PLUMAGE Crown Pale to medium pale gray; supercilium lacking or indistinct Rufous-cinnamon to tawny; distinct white supercilium Pale grayish brown to ginger; indistinct buf supercilium Cinnamon-brown; dis- tinct white supercilium Grayish lavender; moderately distinct, whitish to grayish- white supercilium Bright silvery gray; indistinct whitish supercilium Back Bright chestnut to reddish brown; contrasts distinctly with crown Dull brown to brownish gray; contrasts with crown Pale grayish brown to sandy brown; little or no contrast with crown Brown to cinnamon- brown; little or no contrast with crown Dull dark brown to gray-brown; contrasts distinctly with crown Medium dull rufous-brown; contrasts distinctly with grayer crown Rump Gray Pale to medium brown Pale brown Brown to cinammon- brown Dull dark brown Pale brownish gray Juvenile rectrices Brown Cinnamon to pale rufous Cinnamon Brown to reddish brown Brown Cinnamon Formative and basic rectrices Black with white bases; r6 edged and tipped white Rufous Pale rufous to cinnamon Brown to rufous Brown to warm brown Mixed blackish brown and rufous- brown above; darker tips from below Sides and fanks Pale to dark vinaceous pink, not extending to throat or auriculars Mixed ochraceous and brown, not extending to throat or auriculars Pale cinnamon to cream, extending to throat and auriculars Warm yellow-buf to tawny, not extending to throat or auriculars Deep yellow-buf to tawny; less white in center Mixed pink, ochraceous, orange, and brown, not extending to throat or auriculars Tertial edging Rufous and white Of-white to pinkish buf Buf to pale cinnamon Whitish to pale cin- namon Whitish to pale cin- namon Rufous and white White bases in primaries Occasionally extend beyond primary coverts Usually extend beyond primary coverts; white Usually extend beyond primary coverts; washed buf Very rarely extend beyond primary coverts Very rarely extend beyond primary coverts Extend beyond primary coverts TABLE 1b: STRUCTURE AND MORPHOLOGY Bill size and shape Medium-long and shallow Short and shallow Short and shallow Long and deep Long and deep Medium-short and shallow Wing morphology n 56 36 25 49 23 8 p9-p8 (a) 3-8 (5.7) 5-11 (8.3) 7-12 (9.5) 8-15 (11.6) 8-14 (11.8) p9-p coverts (b) 45-51 (47.6) 42-49 (45.5) 40-47 (43.8) 35-46 (40.5) 37-43 (39.6) Ratio a/b 0.90-0.155 (0.126) 0.136-0.230 (0.187) 0.170-0.255 (0.211) 0.233-0.313 (0.274) 0.225-0.309 (0.268) 0.102-0.138 (0.120) Tail morphology n 52 35 25 48 23 11 r5-r6 (c) 6-11 (8.3) 7-12 (9.6) 7-13 (10.3) 14-24 (18.8) 13-20 (16.7) r6 to tail base (d) 59-68 (63.9) 62-70 (65.7) 63-74 (68.7) 54-62 (57.9) 56-61 (58.2) Ratio c/d 0.091-0.157 (0.126) 0.113-0.181 (0.149) 0.113-0.180 (0.148) 0.248-0.364 (0.304) 0.223-0.335 (0.277) 0.098-0.129 (0.114) 19 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

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