It has numerous subspecies that vary greatly in appearance. One of these, C. f. bocourti (syn. C. f. floweri), has been introduced to Singapore and two regions in Italy, probably a result of the species' popularity in the pet trade.Bertolino, S., & Lurz, P. W. W. (2013). Callosciurus squirrels: worldwide introductions, ecological impacts and recommendations to prevent the establishment of new invasive populations. Mammal Review, 43, 22–33. It is possible that some of the Callosciurus squirrels introduced into Japan are also Finlayson's squirrels.Kuramoto, T., Torii, H., Ikeda, H., Endo, H., Rerkamnuaychoke, W., & Oshida, T. (2012). Mitochondria DNA sequences of Finlayson's squirrel found in Hamamatsu, Shizuoka Prefecture, Japan. Mammal Study, 37, 63–67
