Starlings are lean because they go in flocks.
More Italian Proverbs:
Ask my companion if I be a thief.Italian
A braying ass eats little hay.
Italian
The wolf is always said to be more terrible than he is.
Italian
Who hath little shame the world is all his own.
Italian
The soldier's blood exalts the captain.
Italian
He that would beat his dog can easily find a stick.
Italian