{HEAD ~ A modularly stackable centrally ventilated bird house} that includes a main portion, a ventilation system, and {TAIL ~ a base} 
includes
{ HEAD ~ A modularly stackable centrally ventilated bird house } that includes a main portion , a ventilation system , and { TAIL ~ a base }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL