Sorex minutus is a predator with a particularly high metabolic rate; so high, in fact, that going more than 2 hours without eating could be fatal. Over the course of 24 hours, this efficient hunter will devour prey equal to two thirds of its own weight. Teeth that do that much biting need to be tough - and they are, containing so much iron that the tips are red. Sorex is also extremely territorial, and the males defend their territories with ferocious violence.
I encountered my first specimen this morning - the corpse of the unfortunate creature was making small circuits in our garden, its tiny body(just 4 grams or so) propelled into the air by batting paws.
Our little assassin was having the time of his life. Well, somebody's life.