Answer:
Estruscan Shrew
The smallest mammal by mass is called Etruscan shrew, Suncus etruscus is its binomial name. This shrew weighs about 1.3 - 2.5 grams and are about 1.42 inches long when it reach adult stage.
It is also called as the Etruscan pygmy shrew or the white-toothed pygmy shrew. It belongs to the kingdom of Animalia and the Phylum of Chordata. They usually eat insects and worms.
These mammals live alone, except during mating periods or seasons. Their lifespan is estimated at typically around two years, but with a large uncertainty. They're usually more active during the night and just stay beside their nest during th day. Their life span is about 2 years.
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