{HEAD ~ The ventilation system} includes a stub venting tube that together with a throughbore in the lower floor allow the modularly stackable centrally ventilated bird houses to be stacked, {TAIL ~ four lower compartments}, four lower dowels, four upper compartments, four upper dowels, and a vent cap 
includes
{ HEAD ~ The ventilation system } includes a stub venting tube that together with a throughbore in the lower floor allow the modularly stackable centrally ventilated bird houses to be stacked , { TAIL ~ four lower compartments } , four lower dowels , four upper compartments , four upper dowels , and a vent cap
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