Dutch Birding jaargang 39 nummer 2, 2017

Artikelen / papers

73 Bijzondere legsels uit Nederland in collectie van Naturalis Biodiversity Center [Rare Clutches From The Netherlands In Collection Of Naturalis Biodiversity Center]
Justin J F J Jansen & C S (Kees) Roselaar

The egg collection of Naturalis Biodiversity Center at Leiden, the Netherlands – founded in 1820 – contains no less then 118 635 eggs from 37 758 clutches from c 128 countries. Some of these clutches are from the rarest Dutch breeding species. In this paper, we describe these clutches, based on a database finalized in 2012. Notable are the clutches from Pallas’s Sandgrouse Syrrhaptes paradoxus (1888; two), Great Bustard Otis tarda (1948), Gull-billed Tern Gelochelidon nilotica (1945, 1949 and 1951) and Aquatic Warbler Acrocephalus paludicola (1904, 1923, 1924, 1929, 1933, 1935, 1941 and 1945).


81 Bruine Klauwier in Den Helder in februari-maart 2017
Peter Das, Conny Das & Enno B Ebels

From 19 February to 7 March 2017, a first-year Brown Shrike Lanius cristatus was present in a small city park at Den Helder, Noord-Holland, the Netherlands. Based on the subtle dark scaly markings on uppertail-coverts, scapulars and mantle, it was a first-year. First-year Red-backed Shrike L collurio could be excluded by the relatively large head, heavy bill, long and clearly graduated tail, short primary projection, wing formula, chestnut-brown rump and dark tertial centres. First-year Red-backed also shows more prominent scaly markings on the upperparts and a more greyish neck. The combination of uniform chestnut-brown cap, long, graduated, red-brown tail and absence of a white primary patch excluded Red-tailed Shrike L phoenicuroides and Daurian Shrike L isabellinus. These two have a longer but less graduated tail; in addition, Daurian is paler and more sandy on upperhead and upper­parts and has warmer underparts, and Red-tailed has a more cold grey-brown upperhead and upperparts and less scaly underparts. The red-brown colour of the upperhead, as warm as or warmer than the upperparts, indicated the nominate subspecies L c cristatus. Brown Shrike breeds in eastern Asia. This was the second record for the Netherlands; the first was in January-May 2014. In Europe, there are 38 records, of which most in September-November and a few in winter.


86 New breeding colony of Yellow-legged Gull at Port Fouad, Egypt, in May 2016
Mohamed Habib
87 Presumed Pigeon Guillemots of subspecies snowi off Hokkaido, Japan, in February 2016
Gerry Hinchon
89 Lesser Moorhen captured off Laxe, Spain, in February 2000
Pablo Pita Criado & Manuel Pose Picado
92 Western Palearctic list update: deletion of Fork-tailed Flycatcher
Miguel Rouco
94 Western Palearctic list update: deletion of Louisiana Waterthrush
Miguel Rouco
97 Herziening Nederlandse avifaunistische lijst: Moltoni’s Baardgrasmus afgevoerd [Review Of Dutch Avifaunal List: Deletion Of Moltoni's Warbler]
Steve C V Geelhoed & Enno B Ebels

On 23-26 May 1987, a male ‘subalpine warbler’ Sylvia subalpina/cantillans/inornata was singing and calling at Kennemerduinen, Bloemendaal, Noord-Holland. The bird was identified and accepted 15 years later as Moltoni’s Warbler S subalpina based on the written description of its rattling call, a regularly repeated tsrrr or krrrr resembling Eurasian Wren Troglodytes troglodytes (interestingly, subalpina was not yet described as a valid taxon when this bird was observed, neither were its diagnostic vocalisations). The record was reconsidered in 2014-16 by the Dutch rarities committee (CDNA) following a revision of all subalpine warblers. The CDNA decided that the lack of sound-recordings and the possible confusion with a rattle-like call of Eastern Subalpine Warbler S cantillans made it unsafe to accept this bird as subalpina. Also, the description of the plumage was considered insufficient to exclude cantillans and Western Subalpine Warbler S inornata with certainty. Up to and including 2016, there are (only) seven records of subalpina north of south-eastern France (where it occurs as a migrant): in Belgium (1), England (1), Germany (1) and Scotland (4).


101 Long-tailed Shrike breeding at Atyrau, Kazakhstan, in June-August 2016
Fedor Sarayev
103 Olive-backed Pipits and Yellow-browed Warblers at Cap Blanc peninsula, Mauritania, in November 2016
Rob S A van Bemmelen, Tom van Spanje & C J (Kees) Camphuysen

Varia

106 Vanuatu Petrel
Pierre M A van der Wielen & Roland E van der Vliet
111 Inaccessible Island Rail
Garry Bakker

WP reports

118 February to mid-March 2017
Łukasz Ławicki & Arnoud B van den Berg

Recente meldingen / recent reports

133 Januari-februari 2017
Roy Slaterus, Vincent van der Spek & Martijn Renders

DB Actueel

141 Zwartkoprietzanger in Brabantse Biesbosch [Moustached Warbler]
Julian Bosch
142 New species described in 2016
Łukasz Ławicki & André J van Loon
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