ミゾゴイの非繁殖期における飼育下での採餌行動
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概要
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The Japanese Night Heron Gorsachius goisagi occurs in the Ryukyu Islands, Taiwan, southern China, the Philippines and the Moluccas. It migrates to Japan at the beginning of April and its breeding has been confirmed only in Japan. Its detailed ecology was unknown and it was said to be a nocturnal species. Therefore, in order to clarify its daily behavior, I conducted a behavioral survey on one male and one female of the Japanese Night Heron in captivity in a hospital of a zoological garden from November to December 2008. I used a video tape recorder (VTR) and taped their movements for 24 consecutive hours for eight days and analyzed the video images. Activities such as foraging and walking on the ground were observed only in daytime and no activities were seen at night. During the night, they slept at a fixed roost without moving from it.