The Siberian Weasel, also known as Kolonok, is a medium-sized weasel native to Asia. It has reddish or orange-brown fur and a long, slender body that stretches 11 to 12 inches, with a tail that adds another 6 to 7 inches. 

During winter, its fur changes to a yellow-brown shade, which is an adaptation to the changing environment. Despite being small, it feeds on various prey. It also eats fruits and berries occasionally. 

This type of weasel is also an excellent swimmer and adept tree climber. While it is a solitary animal, it enjoys playful fights and chases.