Otis tarda · Great Bustard
|datum||28 december 2019 t/m 1 april 2020: 96 dagen|
|locatie||Koolhoekweg, Brielle, and Polder Oostvoorne, Westvoorne ZH|
|coördinaten||N 51.90789 O 4.1509|
|aantal, kleed||1, 1e kj vrouw|
|status||Niet aanvaard, gepubliceerd in jaarverslag CDNA|
|opmerkingen||colour-ringed, with data logger, photographed, videoed (@ identification accepted). This colour-ringed (green LT right, Hiddensee BA38676 left) first-winter female with data logger was not accepted. The bird originated from Germany, as all previous sightings of ringed individuals. The bird had hatched in an incubator on 17 May (from an egg collected from the wild) and once full-grown it was released at Havelländische Luch, Brandenburg, 580 km from Brielle. It went missing from 10 November onwards. There were no sightings in Germany (or anywhere else for that matter) after it left Brielle (Henrik Watzke in litt), so apparently it did not return to its natal ground. Since it was born and raised in captivity and thereby a first-generation project bird, it was not accepted. This species is becoming rarer and rarer. The last record dates from 2010, the one before that from 1997. Past records were mainly associated with severe winters and/or heavy snow, and the decrease in records is probably more related to climate factors than it is to population dynamics in Germany.|
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