The author has many times investigated the distribution and breeding localities of the Chinese Hawk-Cuckoo,
Cuculus fugax hyperythrus (GOULD) in Hokkaido since 1931, the result being reported in his previous paper (5). The investigation has been continued since then and the results obtained so far are given in this paper. The species commonly breeds in Honshiu, but it was not believed to occur in Hokkaido until 1930, when the first observation of this species was made in the Daisetsu Mts. by Mr. Kenzo Kobayashi (1). But, many ornithologists were still suspicious with this, because the specimen was not collected.
Since his report (5), 1949, the author has definitely ascertained that this species is quite common, and breeds in the middle and northern portions of Hokkaido. Its song exactly sounds like, "Juichi, Juichi, Juichi, ……", hence the Japanese name, "Juichi, " and by that song the author has recorded it at 15 localities in Hokkaido on the dates ranging from May 16 to July 7, as shown in Fig. 1, and the Prov. of Kitami is a new addition. Although this cuckoo is less common in Hokkaido than the Himalayan and the Japanese Cuckoos, the breeding of these three species is obvious from their occurrence during May and July.
This species is usually found in the forests of Ezo-spruce, Akaezo-spruce, Todo-fir, larch and Japanese cedar, but the author has frequently seen it in the broad-leaved trees of the above forests. Its songs, "Juichi, Juichi, Juichi…… Juk, Juk, Juk, Ju, Ju, Ju, Ju, ……" are heard during the day-time, while that of the Little Cuckoo at night or in cloudy weathers.
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