(heuglini=taimyrensis/
antelius)
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Heuglin's Gull (heuglini=taimyrensis/ antelius) |
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IMAGES:
DESCRIPTION:
First Cycle
Adult
HEUGLIN'S GULL (23-25";51-55")
heuglini=taimyrensis/antelius
| BILL SHAPE: quite slim with little gonydeal angle; about 4x eye diameter; moderate to steep curve to culmen beginning 1/4 to 1/3 from the tip | |||
| HEAD SHAPE: rather small and rounded, on a rather slim, graceful neck; may impart a more delicate look | |||
| WING EXTENSION: long; 1-1.5x bill length | |||
| POSTURE/HABITS: usually smaller and slimmer than argentatus, but larger than most Lesser Black-backed; similar to fuscus in shape; has long, slim legs; taimyrensis averages larger than antelius (except in bill and tarsus length), but still slimmer than vegae. | |||
| FIRST CYCLE | SECOND CYCLE | ADULT | |
| BILL COLOR: | all black or w/ pale pink near the base; may be quite pale by summer | variable, but usually pale pink or yellowish w/ black subterm band; may show some gon spot | yellow, paler at tip, w/ orange-red gon spot; 22% of ante show black mark |
| LEG COLOR: | dirty pale pink; may have blue-gray tone | may remain dirty pinkish or be yellowish | yellow, but often paler than bill; may be greyish; feet may be pinkish; taim occaisionally orange-yellow |
| IRIS/ORB RING: | dark | dark or pale | pale yellow to amber; orb ring red, rarely orange to orange-yellow |
| HEAD: | rather white but with streaking or mottling on crown, nape, and esp. auriculars; thick spotting forms a hindneck collar | white w/ streaking over crown, nape, and aurs; heavy spotting across hindneck, often to breast sides | white w/ fine light streaks on crown and nape, thick spotting forms a hindneck collar; taim. may have heavier streaking at times; nape streaking thru Mar |
| UNDERPARTS: | rather white w/ variable g-b mottling; undt covs barred; quite white by first summer | mostly white; may have some g-b mottling down flanks | white |
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PRIMARIES (folded): |
black | black | black w/ rather small A-spots on P9-10, increasing to fairly large by P6-7; |
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PRIMARIES (in flight): |
dark, may show a faint pale window on the inner Ps | no A-spots present | medium-sized mirror on P10, set back from tip by thick black band; minority w/ small mirror on P9 (on taim usually restricted to the inner web); ante w/ black to P3 or P4; taim w/ black to P4 or P5; dark area contrasts strongly from below; most show whitish base to inner web of P10, often to P7 on taim; white tongues to P7 or P8 create a "string of pearls". |
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SECONDARIES (in flight): |
dark w/ pale fringe | ... | adult gray w/ broad white trailing edge |
| TERTIALS: | quite dark g-b w/ large pale tips and scalloping | quite dark w/ large pale tips | adult gray w/ white crescent to 1/2 bill length |
| GREATER COVERTS: | completely checkered or barred, appearing paler in flight | rather uniform g-b with paler edges | adult gray |
| LESSER & MED COVERTS: | cool g-b w/ pale fringe and dark shaft streak; may show some adult gray by summer | adult gray mixed w/ g-b | adult gray |
| SCAPULARS: | cool gray w/ pale fringe and dark shaft streak; may show some adult gray by summer | adult gray | adult gray w/ small white crescent |
| BACK: | cool gray w/ dark centers; part or all adult gray by summer | adult gray | ante: adult gray is medium slate gray w/ slaty or brown hue, slightly lighter than graellsii; taim: lighter, but still w/ slaty or brown hue |
| RUMP: | white w/ little dark patterning | white | white |
| TAIL: | black w/ pale bases to all retrices, creating a bold black band | white w/ irregular broken black tail band | white |