The Nursery Rhyme was Wrong

Big fleas have little fleas,
Upon their backs to bite 'em,
And little fleas have lesser fleas,
and so, ad infinitum.
Found at Weapon-blog.com today:

I think we have more machinery of government than is necessary, too many parasites living on the labor of the industrious.
Thomas Jefferson
Letter to William Ludlow
September 6, 1824

Every single damned one of the bloodsuckers, from tiniest to largest, suck on the host, not on each other.