What is the smallest species of mammal?

The smallest species of mammal by weight is the Etruscan shrew (Suncus etruscus), weighing only around 1.8 grams (0.063 ounces). This tiny mammal measures about 3.5 centimeters (1.4 inches) in length and is found in parts of Europe, Asia, and North Africa. Despite its small size, the Etruscan shrew has a very high metabolism and must eat nearly double its body weight in food daily. It is an insectivore and spends much of its time foraging for insects and other small invertebrates.