Abstract
Avifauna and vegetation were studied in the Kuroson Natural Observation Forest, Kochi Prefecture. A survey stand was set in the old-growth natural forest in warm-temperate zone where 640-700m above sea level was. A total of 25 bird species, including 19 in the summer and 16 in the winter, were record in the stand. Frequently observed birds were Parus major (great tit), Troglodytes troglodyies (wren), Sphenurus sieboldii (japanese green pigeon) and Cyanoptila cyanomelana (blue-and -white flycather) in the summer, while Fringilla montifringilla (brambling), Hypsipeles amaurotis (brown-eared bulbul). T. troglodyles and Parus ater (coal tit) in the winter. Dominant woody plants with a large basal area were Qurcus salicina, Carpinus laxiflora and Acer mono var. ambiguum.
