The Etruscan shrew's metabolism is so fast that it needs to kill every 2 hours or it dies!
The Etruscan shrew also known as the Etruscan pygmy shrew or the white-toothed pygmy shrew is the smallest known mammal by mass, weighing only about 1.8 grams.
The Etruscan shrew has a body length of about 4 centimetres (1.6 in) excluding the tail. It is characterized by very rapid movements and a fast metabolism, eating about 1.5–2 times it's own body weight per day.
It feeds on various small vertebrates and invertebrates, mostly insects, and can hunt individuals of the same size as itself.
The Etruscan shrew's metabolism is so fast, it needs to eat nearly twice it's body weight PER DAY, it is also ranked as one of the most efficient predators because it needs to kill every 2 hours or it dies