The cricetids are small mammals, ranging from just 5 to 8 cm and 7 grams in weight in the New World Pygmy Mouse, up to 41 to 62 cm and 1,100 grams in the Muskrat. How long the tail is depends on how big the body is, and the tails can be either with hair or a little hair. Most species have brown fur, with a white colored underbelly, but there are also many other patterns, especially in the cricetine and arvicoline subfamilies.