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The first observations of infanticide by a precocial avian species, Spot-billed Duck ( Anas poecilorhyncha ), were recorded on a small pond at Yatsu tidal flat, central Japan, from May to June 2000, where six families of conspecific and one Gadwall A. strepera family, respectively, occupied territories. A female Spot-billed Duck with 11 ducklings attacked ducklings of all the other families killing eight conspecifics and three of the Gadwall. High breeding density (15.0 families/ha) may have increased the aggression of the female.

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We report two records of the Japanese Murrelet Synthliboramphus wumizusume in the breeding season. 1) On 21 April 2003, one adult was observed about 1km offshore of Uchiura Bay, Amatsu-Kominato. 2) On 23 May 2003, two adults and one chick were observed about 2km offshore of Katsuura Bay, Katsuura. This is the first observation record of a chick with adults on the sea around Chiba Prefecture.