A bigamous trio of the Japanese Wagtail Motacilla grandis was observed in the breeding season of 1985 at Utsunomiya, central Honshu. The trio seemed to consist of a pair (A, B) and a female (C). In both of the first and renesting broods, the two females participated in building the nest, incubating the eggs, and feeding the young. It was not known whether or not the subordinate female (C) laid eggs. This trio differs from other bigamous case of this species in which the females occupied mutually exclusive area within the male territory.
One to three Nutcrakers Nucifraga caryocatactes were observed in residential areas and wood islands of suburban areas in Obihiro City and its environs, central Hokkaido, from mid-October 1988 to late June 1989. Besides, Nutcrackers were recorded from Hakodate, Sapporo and Furano from October 1988 to mid-June 1989. Poor cone production of the Japanese Stone Pine Pinus pumila in 1988 was considered to be one of causes of their wintering at low altitudes.