Parasitic Jaeger at Lake McConaughy
On 5 October, 1997, we joined Joel G. Jorgensen and John Sullivan for a pelagic trip on Lake McConaughy. A similar trip in late September 1996 yielded a Sabine's Gull, but we were really hoping to see a jaeger. From 7:00 to 8:30 a.m. we gradually worked our way from the dam towards the western...
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1998
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ftunivnebraskali:oai:digitalcommons.unl.edu:nebbirdrev-1203 2023-11-12T04:24:17+01:00 Parasitic Jaeger at Lake McConaughy Dinsmore, Stephen J Silcock, W. Ross 1998-12-01T08:00:00Z application/pdf https://digitalcommons.unl.edu/nebbirdrev/204 https://digitalcommons.unl.edu/context/nebbirdrev/article/1203/viewcontent/Nebraska_Bird_Review_66_4_Dec_1998_Parasitic_Jaeger_at_Lake_McConaughy_p114_115.pdf unknown DigitalCommons@University of Nebraska - Lincoln https://digitalcommons.unl.edu/nebbirdrev/204 https://digitalcommons.unl.edu/context/nebbirdrev/article/1203/viewcontent/Nebraska_Bird_Review_66_4_Dec_1998_Parasitic_Jaeger_at_Lake_McConaughy_p114_115.pdf Nebraska Bird Review Poultry or Avian Science Zoology text 1998 ftunivnebraskali 2023-10-30T11:01:28Z On 5 October, 1997, we joined Joel G. Jorgensen and John Sullivan for a pelagic trip on Lake McConaughy. A similar trip in late September 1996 yielded a Sabine's Gull, but we were really hoping to see a jaeger. From 7:00 to 8:30 a.m. we gradually worked our way from the dam towards the western end of the lake. Besides moderate numbers of Franklin's and Ring-billed Gulls, there were few birds on the lake. At approximately 8:45 a.m. Dinsmore noticed that all of the gulls at the western end of the lake had suddenly taken flight. Less than a minute later, we simultaneously spotted a jaeger soaring directly overhead. The size, dark coloration, and prominent white flashes in the Wings identified the bird as a jaeger. The bird made a couple of attacks on Franklin Gulls and then flew east down the lake. We chased the jaeger for more than ten miles before losing it. We relocated the bird a short time later just above the dam. This time, the bird attacked a couple of Ring-billed Gulls before flying west up the lake. We again took chase, but lost the bird before reaching Lemoyne. The gull-like shape, generally brown coloration, and prominent white bases to the primaries identified the bird as a jaeger. The bird was smaller but longer-winged than a Ring-billed Gull and larger and slimmer than a Franklin's Gull. The overall coloration was dark brown, except for some warmer rufous tones on the underparts. We saw no visible barring on the underparts. The bill was straight and slender, but the color pattern was not noted. The upperwing was dark brown except for white at the base of at least the outermost four primaries. The underwing was also dark except for a prominent white area on the undersides of the bases of the primaries. The rectrices were dark and the central feathers were slightly elongated with pointed tips. We all agreed on the identification as a juvenile Parasitic Jaeger. Careful size comparisons to Franklin and Ring-billed Gulls eliminated juvenile Pomarine Jaeger, which also generally shows more white color on ... Text Parasitic Jaeger Pomarine Jaeger Sabine's Gull University of Nebraska-Lincoln: DigitalCommons@UNL Sullivan ENVELOPE(-63.817,-63.817,-69.650,-69.650) |
institution |
Open Polar |
collection |
University of Nebraska-Lincoln: DigitalCommons@UNL |
op_collection_id |
ftunivnebraskali |
language |
unknown |
topic |
Poultry or Avian Science Zoology |
spellingShingle |
Poultry or Avian Science Zoology Dinsmore, Stephen J Silcock, W. Ross Parasitic Jaeger at Lake McConaughy |
topic_facet |
Poultry or Avian Science Zoology |
description |
On 5 October, 1997, we joined Joel G. Jorgensen and John Sullivan for a pelagic trip on Lake McConaughy. A similar trip in late September 1996 yielded a Sabine's Gull, but we were really hoping to see a jaeger. From 7:00 to 8:30 a.m. we gradually worked our way from the dam towards the western end of the lake. Besides moderate numbers of Franklin's and Ring-billed Gulls, there were few birds on the lake. At approximately 8:45 a.m. Dinsmore noticed that all of the gulls at the western end of the lake had suddenly taken flight. Less than a minute later, we simultaneously spotted a jaeger soaring directly overhead. The size, dark coloration, and prominent white flashes in the Wings identified the bird as a jaeger. The bird made a couple of attacks on Franklin Gulls and then flew east down the lake. We chased the jaeger for more than ten miles before losing it. We relocated the bird a short time later just above the dam. This time, the bird attacked a couple of Ring-billed Gulls before flying west up the lake. We again took chase, but lost the bird before reaching Lemoyne. The gull-like shape, generally brown coloration, and prominent white bases to the primaries identified the bird as a jaeger. The bird was smaller but longer-winged than a Ring-billed Gull and larger and slimmer than a Franklin's Gull. The overall coloration was dark brown, except for some warmer rufous tones on the underparts. We saw no visible barring on the underparts. The bill was straight and slender, but the color pattern was not noted. The upperwing was dark brown except for white at the base of at least the outermost four primaries. The underwing was also dark except for a prominent white area on the undersides of the bases of the primaries. The rectrices were dark and the central feathers were slightly elongated with pointed tips. We all agreed on the identification as a juvenile Parasitic Jaeger. Careful size comparisons to Franklin and Ring-billed Gulls eliminated juvenile Pomarine Jaeger, which also generally shows more white color on ... |
format |
Text |
author |
Dinsmore, Stephen J Silcock, W. Ross |
author_facet |
Dinsmore, Stephen J Silcock, W. Ross |
author_sort |
Dinsmore, Stephen J |
title |
Parasitic Jaeger at Lake McConaughy |
title_short |
Parasitic Jaeger at Lake McConaughy |
title_full |
Parasitic Jaeger at Lake McConaughy |
title_fullStr |
Parasitic Jaeger at Lake McConaughy |
title_full_unstemmed |
Parasitic Jaeger at Lake McConaughy |
title_sort |
parasitic jaeger at lake mcconaughy |
publisher |
DigitalCommons@University of Nebraska - Lincoln |
publishDate |
1998 |
url |
https://digitalcommons.unl.edu/nebbirdrev/204 https://digitalcommons.unl.edu/context/nebbirdrev/article/1203/viewcontent/Nebraska_Bird_Review_66_4_Dec_1998_Parasitic_Jaeger_at_Lake_McConaughy_p114_115.pdf |
long_lat |
ENVELOPE(-63.817,-63.817,-69.650,-69.650) |
geographic |
Sullivan |
geographic_facet |
Sullivan |
genre |
Parasitic Jaeger Pomarine Jaeger Sabine's Gull |
genre_facet |
Parasitic Jaeger Pomarine Jaeger Sabine's Gull |
op_source |
Nebraska Bird Review |
op_relation |
https://digitalcommons.unl.edu/nebbirdrev/204 https://digitalcommons.unl.edu/context/nebbirdrev/article/1203/viewcontent/Nebraska_Bird_Review_66_4_Dec_1998_Parasitic_Jaeger_at_Lake_McConaughy_p114_115.pdf |
_version_ |
1782338782138204160 |