Therefore, depending on whether you are considering mass or length as the defining factor, either the Etruscan shrew or the bumblebee bat can be considered the smallest mammal, each holding a unique record in their respective category.
Depending on how you define your terms either the etruscan shrew or bumblebee bat is smallest of which animals?
The Etruscan shrew (Suncus etruscus) is generally considered to be the smallest mammal by mass, with adults typically weighing between 1.8 and 2.5 grams. The bumblebee bat (Craseonycteris thonglongyai), on the other hand, holds the title for being the smallest mammal by length, with adults measuring just 29-33 millimeters in body length.