1. Biodiversity Center of Japan (2012) The 6–7th national surveys on the natural environment. http://www.biodic.go.jp/kiso/fnd_list_h.html. Accessed 20 Mar 2021
2. Brown DE (1982) The use of “Clippings” to index tassel-eared squirrel population levels. J Wildl Manag 46:520–525
3. Cotton CL, Parker KL (2000) Winter habitat and nest trees used by northern flying squirrels in subboreal forests. J Mamm 81:1071–1086
4. Deguchi Y, Isogai N, Wakou RT, Nishi C (2017a) Seasonal and daily changes in the shortest distances between the location of Japanese squirrels relative to the walnut trees in Takamatsu Park, Morioka, Iwate Prefecture. Bull Iwate Univ For 48:33–40 (in Japanese with English summary)
5. Deguchi Y, Kamimizu A, Nishi C (2017b) Selection of feeding location after food collection of the Japanese squirrel in Takamatsu Park, Morioka, Iwate Prefecture. Bull Iwate Univ For 48:41–46 (in Japanese with English summary)