In this study, we examined some biological characteristics of Mustela nivalis from Kırıkkale and Çorum in Central Anatolia, collected between 2011-2012. The specimens studied had “nivalis”-type coloration, by an straight demarcation line between the dorsal and ventral part of the body.The structure of the hair was “broad petal” at the proximal of shaft, while “elongate petal” at distal. Tip of the baculum was hook-shaped having two developed knobs in adults. An ectoparasite, Haemaphysalis sulcata,is also detected on specimens. Comparison with the previous data on body size, we conclude that specimens from Central Anatolia were bigger than the European specimens with respect to external and cranial measurements.