关键词: 赤狐, 洞穴, 环境

Abstract: In fivekinds of different enviroment from Hulin county of Heilongjiang province, western suburb of Harbin andXianghai natural conservation of Jilin province, the author has observed and analysed 83 fox den and 120 den openings. The results showed that two kinds dens in five different environment were found, one is the main den and another is the temporary den, they werenodifferences in district. The main den has two openings and the temporaryden has one opening. The overall means were 26.48(±1.03)cm in the opening width, 26.35(±1.24)cm in the opening height. The first tunnel length of the red fox den is 117.86(±8.38)cm. The dens opening faced the sunlight accounting for 46.67%, and fox dens located at the top of the slop accounting for 60.24%．

Key words: Red fox(Vulpex vulpes), Den, environment