Fluitzwaan

Cygnus columbianus  ·  Whistling Swan

id 4154
datum 18 t/m 28 december 1998: 11 dagen
gekoppeld aan 4150
gemeente Aa en Hunze (DR)
locatie Gieterveen
coördinaten N 53.03257  O 6.8444
aantal, kleed 1, adult
soort waarneming veldwaarneming
status Niet aanvaard, gepubliceerd in jaarverslag CDNA
waarnemer(s) E. Klunder, P. Zuidhof
opmerkingen Based on newly described identification features other than the amount of black on the bill (Visscher & van Duivendijk 2015), all five records were reassessed. According to Evans & Sladen (1980), only a small minority (4.3%) show more than 10% yellow on the bill. This minority type however seems to be over-represented in Dutch records. This was, eg, the case for a widely twitched bird in Drenthe, Friesland and Groningen in the winters of 1997/98 and 1998/99. ‘Hybrigades’ with Bewick’s Swan C bewickii are a realistic option, and Bewick’s with aberrant bills are not unheard of (Evans & Sladen 1980). Identification based on a single feature is therefore tricky, especially in birds with a relatively large amount of yellow on the bill. The presence of the new features could not be determined in the records. It was therefore decided that all records are no longer proven and, as a consequence, Whistling Swan was removed from the Dutch list. Annual Report 2018.
gekoppelde gevallen 4150 28 november 1997 t/m 8 februari 1998
Veendam (GR) Veendam
4151 28 november 1997 t/m 8 februari 1998
Midden-Groningen (GR) Hoogezand-Sappemeer
4152 28 november 1997 t/m 8 februari 1998
Aa en Hunze (DR) Nieuw-Annerveen
4153 28 november 1997 t/m 8 februari 1998
Aa en Hunze (DR) Spijkerboor
4154 18 t/m 28 december 1998
Aa en Hunze (DR) Gieterveen
30044 18 t/m 28 december 1998
Aa en Hunze (DR) Eexterveen
4155 5 t/m 9 januari 1999
Het Hogeland (GR) Lauwersmeer
4156 10 januari 1999
Noardeast-Fryslân (FR) Kwelderweg

Beschik je over foto's of andere extra informatie of heb je opmerkingen over dit geval? Neem dan contact met ons op.

Contact