What is the world's smallest mammal by mass?

Long-tailed planigale
Pygmy possum
Etruscan shrew
Pygmy jerboa
The Etruscan shrew is the smallest known mammal by mass, weighing only about 1.8 grams (0.063 oz) on average. The bumblebee bat is regarded as the smallest mammal by skull size and body length. It is characterized by very rapid movements and a fast metabolism, eating about 1.5–2 times its own body weight per day.
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Answers by country

Long-tailed planigale
Pygmy possum
Etruscan shrew
Pygmy jerboa
answers
flagSweden
0%
0%
95%
5%
20
flagAustralia
0%
13%
73%
13%
30
flagPakistan
0%
0%
70%
20%
10
flagthe United States
0%
20%
68%
10%
83
flagGreece
13%
6%
53%
26%
15
flagthe United Kingdom
5%
32%
40%
18%
37
flagPoland
10%
12%
39%
37%
1514
flagAustria
7%
11%
37%
44%
27
flagGermany
25%
5%
33%
35%
105
flagIndia
10%
43%
32%
12%
73