Dutch Birding jaargang 39 nummer 2, 2017


Ring-necked Duck  ·  Aythya collaris
Miłosz Kowalewski

Artikelen / papers

73 - 80 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 - 85 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 - 88 Presumed Pigeon Guillemots of subspecies snowi off Hokkaido, Japan, in February 2016
Gerry Hinchon
89 - 91 Lesser Moorhen captured off Laxe, Spain, in February 2000
Pablo Pita Criado & Manuel Pose Picado
92 - 93 Western Palearctic list update: deletion of Fork-tailed Flycatcher
Miguel Rouco
94 - 96 Western Palearctic list update: deletion of Louisiana Waterthrush
Miguel Rouco
97 - 100 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 - 102 Long-tailed Shrike breeding at Atyrau, Kazakhstan, in June-August 2016
Fedor Sarayev
103 - 105 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


106 - 110 Vanuatu Petrel
Pierre M A van der Wielen & Roland E van der Vliet
111 - 117 Inaccessible Island Rail
Garry Bakker

WP reports

118 - 132 February to mid-March 2017
Łukasz Ławicki & Arnoud B van den Berg

Recente meldingen / recent reports

133 - 140 Januari-februari 2017
Roy Slaterus, Vincent van der Spek & Martijn Renders

DB Actueel

141 - 142 Zwartkoprietzanger in Brabantse Biesbosch [Moustached Warbler]
Julian Bosch
142 - 143 New species described in 2016
Łukasz Ławicki & André J van Loon