Original: The Etruscan Shrew ( Suncus etruscus ) , also known as the Etruscan Pygmy Shrew or the White-toothed Pygmy Shrew is the smallest known mammal by mass , weighing only about 2 grams , although the smallest known mammal by skull size is the Bumblebee Bat .
Simplified: The Etruscan Shrew ( Suncus etruscus ) , also known as the Etruscan Pygmy Shrew or the White-toothed Pygmy Shrew is the smallest known mammal by mass .