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 on average ( The bumblebee bat is regarded as the smallest mammal by skull size ) .
The Etruscan shrew ( `` Suncus etruscus '' ) is also known as the Etruscan pygmy shrew or the white-toothed pygmy shrew . It is the smallest known mammal by mass .