What is the skinniest mammal in the world?

By mass, the smallest mammal in the world is the Etruscan Shrew, Suncus Etruscus, which weighs only about 2 grams. By length/size, the smallest mammal in the world is Kitti's Hog-Nosed Bat, Craseonycteris Thonglongyai, which is only 29-33 millimeters long.