He would slaughter a bug to drink its blood.
More Italian Proverbs:
Illness tells us what we are.Italian
The best swimmer is the first to drown himself.
Italian
He is not a wise man who cannot play the fool on occasions.
Italian
A book whose sale's forbidden all men rush to see, and prohibition turns one reader into three.
Italian
It is the first shower that wets.
Italian
Gluttony kills more than the sword.
Italian