The First Record of Reddish-brown Egg Parasitism by the Oriental Cuckoo <i>Cuculus optatus</i> upon the Black-faced Bunting <i>Emberiza spodocephala</i> in Western Hokkaido

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  • Kawaji Noritomo
    Hokkaido Research Center, Forestry and Forest Products Research Institute Graduate School of Dairy Science, Rakuno Gakuen University
  • Kawaji Kimiko

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  • 北海道西部におけるツツドリ<i>Cuculus optatus</i>によるアオジ<i>Emberiza spodocephala</i>巣への赤褐色卵托卵例
  • 北海道西部におけるツツドリCuculus optatusによるアオジEmberiza spodocephala巣への赤褐色卵托卵例
  • ホッカイドウ セイブ ニ オケル ツツドリ Cuculus optatus ニ ヨル アオジ Emberiza spodocephala ソウ エ ノ アカ カッショクランタクランレイ

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Abstract

<p>In the lowland deciduous broad-leaved forests of western Hokkaido, reddish-brown egg parasitism by the Oriental Cuckoo Cuculus optatus has been recorded for three species: the Eastern Crowned Leaf Warbler Phylloscopus coronatus, the Japanese White-eye Zosterops japonicus and the Asian Stubtail Urosphena squameiceps. We here describe for the first time in this area reddish-brown egg parasitism by the Oriental Cuckoo on a fourth species, the Black-faced Bunting Emberiza spodocephala, and document the incubation and feeding of a nestling by the host. The nest was built in a low bamboo clump, but was initially vacant. A single egg was laid by the parasite three days later. The incubation period was 12–13 days and the nestling period was 18 days. This case was remarkable in that the bunting accepted only one, differently colored, egg from the parasite, and fed the nestling.</p>

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