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European Rarities

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Old Thursday 8th November 2018, 22:35   #5301
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Surely the distance is immaterial. Better to call it 10 miles from Norway, because that is the about only distance that matters ... once a bird is past that point, it is dead in the water
... unless it gets to the next land along its chosen trajectory (directly or by boat/rig hopping), however far that is
Not entirely - a bird's potential maximum overwater flight distance is calculable, from various factors including weight of fat, weather conditions, etc. There may be cases where a bird can reach land say, 300 km away, but might drop dead exhausted before it reaches 400 km.
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Old Sunday 11th November 2018, 11:26   #5302
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Not entirely - a bird's potential maximum overwater flight distance is calculable, from various factors including weight of fat, weather conditions, etc. There may be cases where a bird can reach land say, 300 km away, but might drop dead exhausted before it reaches 400 km.
I do hear this said. So lets assume a first-year female Tengmalm's Owl with a wing length of 170mm, a high fat score of 6-7, weighing in at 162gm flying over the sea at an air temperature of 14C for half the journey, 9C the other half, in a force 5 southeasterlies. All the information needed for the calculation? I look forward to the answer...
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Old Sunday 11th November 2018, 11:49   #5303
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I do hear this said. So lets assume a first-year female Tengmalm's Owl with a wing length of 170mm, a high fat score of 6-7, weighing in at 162gm flying over the sea at an air temperature of 14C for half the journey, 9C the other half, in a force 5 southeasterlies. All the information needed for the calculation? I look forward to the answer...
Me too.... I've heard it said that any half decent aerodynamicist can prove mathematically that a bumblebee cannot fly.

Which is not to say mathematics has nothing to tell us, but put in sufficient variables and you are into the realms where that damn butterfly in New York matters more than all the theories and calculations anyone can make.

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Old Sunday 11th November 2018, 11:58   #5304
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Well that's something, Richard; I didn't realize just how light Tengmalm's Owls are, well under the weight of a Green Woodpecker.
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Old Sunday 11th November 2018, 12:07   #5305
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Me too.... I've heard it said that any half decent aerodynamicist can prove mathematically that a bumblebee cannot fly. John
That was before we discovered that air acts like a sticky fluid at the microscopic level, a factor which the bumblebee exploits in its wingbeat.

That stickiness is also involved in the initiation of vortices and also helps explain why spiderlings can 'fly' further than the limits derived from earlier calculations.
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Old Sunday 11th November 2018, 12:38   #5306
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That was before we discovered that air acts like a sticky fluid at the microscopic level, a factor which the bumblebee exploits in its wingbeat.

That stickiness is also involved in the initiation of vortices
Accordingly, this Tengmalm's should have overshot the Orkneys and be currently slumming itself in some toilet upon the Bahamas 🙂
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Old Sunday 11th November 2018, 12:59   #5307
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That was before we discovered that air acts like a sticky fluid at the microscopic level, a factor which the bumblebee exploits in its wingbeat.

That stickiness is also involved in the initiation of vortices and also helps explain why spiderlings can 'fly' further than the limits derived from earlier calculations.
MJB
Which is why "oh look, it's actually here" is more relevant than realms of theoretical calculation about why it's not possible.

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Old Tuesday 13th November 2018, 13:16   #5308
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Putative Naumann's Thrush near Kalmar, Sweden today. Photos here: https://www.artportalen.se/Image/2254703

To me the hint of dark speckling on the breast are a little worrying, but I don't have much experience of either species or their intergrades in the field.
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Old Tuesday 13th November 2018, 16:37   #5309
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Putative Naumann's Thrush near Kalmar, Sweden today. Photos here: https://www.artportalen.se/Image/2254703

To me the hint of dark speckling on the breast are a little worrying, but I don't have much experience of either species or their intergrades in the field.
I believe the dark speckling on the breast that you allude to, are damp feathers to the leading edge of the wing. Other than that it appears to conform to Naumann’s.

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Old Tuesday 13th November 2018, 16:54   #5310
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I believe the dark speckling on the breast that you allude to, are damp feathers to the leading edge of the wing. Other than that it appears to conform to Naumann’s.

Cheers
Not sure I agree with you regarding dampness. See this photo too: https://www.artportalen.se/Image/2254708

I hope it is a pure Naumann's as it would be a first for Sweden. Just not 100% sure yet.
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Old Tuesday 13th November 2018, 17:18   #5311
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According to Advanced Bird ID Handbook (Van Duivendijk) black spotting to lateral throat area and breast is OK for 1st-w which the bird is by virtue of the retained pale-tipped greater coverts. Females underparts are duller (less orange) intermixed grey and black spotting which accords well with this individual.

http://orientalbirdimages.org/search..._ID=&Location=

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Old Tuesday 13th November 2018, 19:08   #5312
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Oof. Pied Bush Chat near Ulricehamn, Sweden on the 8th of November too. Another first for Sweden
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Old Tuesday 13th November 2018, 21:02   #5313
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Oof. Pied Bush Chat near Ulricehamn, Sweden on the 8th of November too. Another first for Sweden
https://twitter.com/TarsigerTeam/sta...421069314?s=20
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Old Tuesday 13th November 2018, 21:10   #5314
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I believe that the response to the Tweet is suggesting that the outline on the Pied Bushchat could be more convincing........?

All the best
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Old Tuesday 13th November 2018, 21:24   #5315
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Oof. Pied Bush Chat near Ulricehamn, Sweden on the 8th of November too. Another first for Sweden
Siberian Rubythroat, Slaty-backed Gull, Naumann's Thrush and Pied Bush Chat, four new species for Sweden in three weeks, incredible!

Or maybe it was just time to add these species to Swedish list as all four have also been recorded in Finland in the past years. And not only recorded but also been twitchable.
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Old Tuesday 13th November 2018, 21:55   #5316
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I believe that the response to the Tweet is suggesting that the outline on the Pied Bushchat could be more convincing........?

All the best
Two other images available on Facebook - havent sven any grumbling from the Swedish guys
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Old Tuesday 13th November 2018, 22:11   #5317
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Two other images available on Facebook - havent sven any grumbling from the Swedish guys
Nice typo.
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Old Tuesday 13th November 2018, 22:22   #5318
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More pics here

https://m.facebook.com/groups/167537...32950400112531
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Old Tuesday 13th November 2018, 22:59   #5319
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Two other images available on Facebook - havent sven any grumbling from the Swedish guys
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Cheers both.
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Old Wednesday 14th November 2018, 09:07   #5320
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The Pied Bushchat photos were taken from a car window with a mobile phone, which accounts for the depth of field and slightly blurry quality to the images. The sighting is being treated as genuine here and there is more than one image of the bird. Im sure there are birders following up on the bird today, but the chances of it still being in the area five days later must be low, despite the overcast and wet conditions here in the past week.

Naummanns Thrush is still present this morning in Smaland and is drawing big crowds.
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Old Wednesday 14th November 2018, 18:47   #5321
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The first Desert Wheatear for NW Europe this year (if I'm not mistaken) was photographed at the Brouwersdam, the Netherlands, today: https://waarneming.nl/waarneming/view/164555360
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Old Wednesday 14th November 2018, 19:15   #5322
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Influx of juvenile Brown Boobies into the Canary Islands (or one very mobile individual)

https://www.reservoirbirds.com/viewi...NcP0GwfkDxKsA0
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Old Thursday 15th November 2018, 07:45   #5323
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Pine Grosbeak in the Canaries, photographed in southern Tenerife!!
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Old Thursday 15th November 2018, 09:24   #5324
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Pine Grosbeak in the Canaries, photographed in southern Tenerife!!
What!!! Surely not. Link?
Escapee at best......
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Old Thursday 15th November 2018, 13:41   #5325
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Pine Grosbeak in the Canaries, photographed in southern Tenerife!!
If it is real, maybe vagrant all the way from Americas?
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