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This will be my last report for this season as night migration is small and
soon weather conditions will place added stress on microphones.
This week there were a total 79 night flight calls, mostly sparrows
including American Tree Sparrows. A possible rare vagrant was recorded this
week: one or more Smith's Longspurs. On October 31, 2012 at 12:59 AM
longspur rattles were recorded for a period of 13 seconds. The spectrograms
of the rattles fit exceptionally well with Smith's Longspur. The
distinguishing characteristics of its rattle are it's high frequency
compared to Lapland Longspur (more than 1 kHz difference), it's shorter
duration (~13 vs 18 ms), and the shape of the individual rattle notes,
emphasizing a rising note in Smith's and a descending note in Lapland. In
addition, listening to the rattles and comparing them with known recordings
of Smith's and Lapland again strongly suggest Smith's. (The rattle of the
Snow Bunting has a still lower frequency).
The summary of night flight calls for the week beginning the evening of 26
October and ending the morning of 2 November is as follows:
Canada Goose - 1
Killdeer - 1
Boreal Chickadee - 1
Golden-crowned Kinglet - 1
Hermit Thrush - 3
Yellow-rumped Warbler - 2
American Tree Sparrow - 11
Savannah Sparrow - 3
Fox Sparrow - 1
Song Sparrow - 17
White-throated Sparrow - 20
Dark-eyed Junco - 1
Unidentified Sparrows - 6
Longspur(s) - see above
Unidentified songbirds - 1
Unidentified birds - 1
Total - 79
Updated charts can be viewed at:
http://www.johnfkearney.com/Nocturnal_Migration.html
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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-CA link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif"'>This will =
be my last report for this season as night migration is small and soon =
weather conditions will place added stress on =
microphones.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif"'>This week =
there were a total 79 night flight calls, mostly sparrows including =
American Tree Sparrows. A possible rare vagrant was recorded this week: =
one or more Smith’s Longspurs. On October 31, 2012 at 12:59 AM =
longspur rattles were recorded for a period of 13 seconds. The =
spectrograms of the rattles fit exceptionally well with Smith’s =
Longspur. The distinguishing characteristics of its rattle are =
it’s high frequency compared to Lapland Longspur (more than 1 kHz =
difference), it’s shorter duration (~13 vs 18 ms), and the shape =
of the individual rattle notes, emphasizing a rising note in =
Smith’s and a descending note in Lapland. In addition, listening =
to the rattles and comparing them with known recordings of Smith’s =
and Lapland again strongly suggest Smith’s. (The rattle of the =
Snow Bunting has a still lower frequency).<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif"'>The =
summary of night flight calls for the week beginning the evening of 26 =
October and ending the morning of 2 November is as =
follows:<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> =
</o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif"'>Canada =
Goose – 1<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif"'>Killdeer =
– 1<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif"'>Boreal =
Chickadee – 1<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif"'>Golden-crow=
ned Kinglet – 1<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif"'>Hermit =
Thrush – 3<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif"'>Yellow-rump=
ed Warbler – 2<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif"'>American =
Tree Sparrow – 11<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif"'>Savannah =
Sparrow – 3<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif"'>Fox =
Sparrow – 1<o:p></o:p></span></p><p class=3DMsoNormal><