Dutch Birding jaargang 33 nummer 6, 2011

Artikelen / papers

357 Rare birds in the Netherlands in 2010
Arjan Ovaa, Dick Groenendijk, Max Berlijn & CDNA
377 Eleonora’s Valk in Oostvaardersplassen in september 2011
Gilbert Rijmenans & Enno B Ebels

Eleonora\'s Falcon at Oostvaardersplassen in September 2011

On 17 September 2011, a group of c 50 birders from Belgium on a day trip to the Netherlands found and photographed a dark-morph Eleonora\'s Falcon Falco eleonorae at Oostvaardersplassen, Flevoland. The bird frequented an open forest area close to a large wetland area and roosted in dead trees. It was catching dragonflies on several occasions. The bird was watched from c 12:20 to 12:50 and last seen flying in a southerly or south-westerly direction; it was not seen by other observers. The next day, several 10s of birders searched the area, again without success. Based on the photographs, the bird was identified as a second-calendar year, mainly because of the blue-grey cere and orbital ring; the feet were yellow. The plumage was all dark with a brownish tinge. On the breast, a ghost pattern of breast streaking was visible. On the tertials and tail-feathers, dark brown barring was present. The underwing-coverts were black. Size and shape were comparable with a large and long-winged Eurasian Hobby F subbuteo. These characters only fit a second calendar-year Eleonora\'s and exclude pitfalls like Red-footed Falcon F vespertinus, dark-morph Eurasian Hobby, aberrant Common Kestrel F tinnunculus or Peregrine Falcon F peregrinus, or escaped falcons, including hybrids.
If accepted, this is the first record for the Netherlands. The species is rare in central and north-western Europe, with records in Britain (6), the Czech Republic (1), Denmark (2+), Finland (1), Germany (c 4), Hungary (4), Lithuania (1), Poland (10+), Sweden (16+) and Switzer­land (1). Records are concentrated in spring (late April-June) and autumn (August-October), with most in August-September. Dark morph individuals represent c 30% of the whole population and are also rarer as vagrant than pale morph. However, because dark morph birds are probably more easily detected as \'something rare\' than pale morph birds, there may be some bias towards dark morph individuals being found as vagrants.

Gilbert Rijmenans, Gelrodeweg 91, 3200 Aarschot, België
(dejille@skynet.be)
Enno B Ebels, Joseph Haydnlaan 4, 3533 AE Utrecht, Nederland
(ebels@wxs.nl)

382 Adult males Western Marsh Harrier with pale primary markings
Karel A Mauer

Varia

386 Pacific albatrosses: Laysan, Short-tailed, Black-footed and Waved Albatross
Otto Plantema

Corrigenda

394 ??
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DBA nieuws

394 Betaling van abonnementsgeld voor 2012; Payment of subscription for 2012
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WP reports

394 late September to early November 2011
Arnoud B van den Berg & Marcel Haas

Recente meldingen / recent reports

415 september-oktober 2011
Roy Slaterus & Vincent van der Spek

DB actueel

429 Langstaartklauwier bij Den Helder [Long-tailed Shrike]; Hans ter Haar 1957-2011
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