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.
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
I found an adult intersex presumed wild hybrid between a Falcated Duck Anas falcata and a Mallard A. platyrhynchos at Hassamu River, Tonden, Kitaku, Sapporo, Hokkaido on 28 March 2019. This is the first record in Japan, and an uncommon record in the world.
In 2002, the Japan Bird Migration Research Center compiled longevity records based on the research during 1961–1995. Subsequently, additional data have been updated in each issue of the Bird Banding Research Annual Report of Japan. However, no complete list has been published. Here, we report the top two longevity records of each species based on the Japan Bird Banding data during 1961–2017.