Drifters, if they could be. 
Sometimes, when they think 
no one is watching, 
they near the barbed wire. 
 
Hooves and hooves and hooves. 
A silent choir, a mass 
of muscle-held cellmates. 
 
Their heads are full of high grass  
and long shadows. They dream  
of lowland lions grifting gazelle.  
 
Behold the moiré bolting 
of the chain-gang jumpsuits 
—dust and dust and dust— 
safe in their target-striped caps!
C.J. Sage
http://www.poemhunter.com/poem/san-simeon-hill-zebras/