Journal of the Yamashina Institute for Ornithology
Online ISSN : 1882-0999
Print ISSN : 1348-5032
ISSN-L : 1348-5032
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  • Yuzo Fujimaki
    2020 Volume 52 Issue 1 Pages 1-9
    Published: June 30, 2020
    Released: July 12, 2020
    JOURNALS RESTRICTED ACCESS

    The Rufous Hawk-Cuckoo Hierococcyx hyperythrus was censused along 1,169 transects (2 km in length) situated in 1,034 quadrats (4.5×5 km in size) in Hokkaido from late April to late July, 1976–2019. In addition to these, information about presence or absence of the species in another 602 quadrats were obtained from spot census, literature and personal records for illustrating a distribution map. Rufous Hawk-Cuckoos were recorded over almost all of Hokkaido except plains and the northern and eastern parts. They occurred in 16.9% of 1,034 quadrats. Proportions of quadrats in which Rufous Hawk-Cuckoos were recorded have a tendency to decrease in the northern and eastern areas.

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  • Tomokazu Watanabe, Kazuo Obata
    2020 Volume 52 Issue 1 Pages 10-15
    Published: June 30, 2020
    Released: July 12, 2020
    JOURNALS RESTRICTED ACCESS

    We observed foraging of Nymphoides peltata root systems by the Eurasian Coot Fulcia atra at Lake Nishiura, a part of Kasumigaura, Ibaraki Prefecture. On November 24, 2016, a Eurasian Coot swallowed rhizome, roots, and the flowering stem or petiole. Floating leaves and stems are often foraged by waterfowl, but this observation is a rare record of birds foraging on root systems of Nymphoides peltata

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