I observed that Azure-winged Magpies Cyanopica cyana stole cached prey of a Japanese Lesser Sparrowhawk Accipiter gularis at a small wooded park in Utsunomiya, central Honshu in late May 1992. The breeding stage of this hawk's pair was during 1 to 5 days after hatching. A male hawk cached the surplus prey that had been caught more frequently than female was needed. The caching behavior was observed 7 times during the observation period of a total 440 minutes, and all of them were stolen by magpies. All the prey items were Tree Sparrows Passer montanus. Azure-winged Magpies took away the sparrows as soon as the hawk flew away from caching sites. Because the hawk's foods are plentiful in this area and the magpies did not rob the prey directly from the hawk, it is unlikely that Azure-winged Magpies have a serious effect on breeding success of Japanese Lesser Sparrowhaks.
A total of 44 sight records and 4 capture records for 7 species of egrets and herons, Nycticorax nycticorax, Butorides striatus, Ardeola bacchus, Bubulcus ibis, Egretta alba, E.intermedia and E.garzetta, have been made on Rishiri Island(45°10′N, 141°15′E), northern Hokkaido, from 1974 to 1992.Of these records E.intermedia accounted for 29% of the total records, followed by B.ibis(20%). In most cases they were seen singly in marshes around ponds.The records concentrated in spring and early summer(21% in April, 61% in May and 10% in June).
A wintering Trumpeter Swan Cygnus baccinater was observed in flocks of the Whooper Swan Cygnus cygnus in the Kitakami River, Kitakami City, lwte Prefecture. The bird stayed for 26 days from March 29 to April 24, 1992. A single Trumpeter Swan was sighted with a flock of 17 Whooper Swans at the Kitakami River, Morioka City, Iwate Prefecture on December 15, 1991, while a resting Trumpeter Swan was reported at Izunuma Pond, Miyagi Prefecture on December 20, 1991 with four Whooper Swans including three young. The Trumpeter Swan at Kitakami City left for the north with 27 Whooper Swans in the early morning of April 24, 1992. As a result of comparison with photos and video tapes taken, the Trumpeter sighted at three different localities was identified as the same individual.