▁seemed ▁to ▁indicate ▁the ▁presence ▁of ▁a ▁dia ph rag m . ▁The ▁large ▁li ver ▁would ▁have ▁completely ▁divided ▁the ▁body ▁cav ity ▁into ▁an ▁anterior ▁section ▁for ▁the ▁heart ▁and ▁l ungs ▁and ▁a ▁posterior ▁section ▁for ▁the ▁int est ines . ▁This ▁would ▁have ▁indicated ▁the ▁presence ▁of ▁sept ate ▁l ungs , ▁vent il ated ▁by ▁a ▁he p atic - p ist on ▁dia ph rag m , ▁driven ▁by ▁the ▁li ver ▁and ▁a ▁Mus cul us ▁dia ph rag m atic us , ▁which ▁in ▁the ▁foss il ▁was ▁vis ibly ▁attached ▁to ▁the ▁pub es . ▁Such ▁a ▁system ▁would ▁be ▁an ▁argument ▁against ▁the ▁idea ▁that ▁birds , ▁whose ▁l ungs ▁are ▁vent il ated ▁by ▁air - s acs , ▁are ▁co el u ros aur ian ▁ther op ods , ▁and ▁an ▁indic ation ▁ther op ods ▁were ▁cold - blo oded . ▁ ▁John ▁Rub en ' s ▁conclus ions ▁have , ▁however , ▁been ▁question ed ▁by ▁some ▁scient ists , ▁such ▁as ▁Lawrence ▁Wit mer , ▁who ▁claimed ▁the ▁study ▁to ▁be ▁fla wed . ▁The ▁ 2 0 1 1 ▁study ▁concluded ▁that ▁due ▁to ▁the ▁fact ▁that ▁the ▁li ver ▁had ▁been ▁preserved ▁as ▁a ▁vague ▁h alo , ▁representing ▁body ▁flu ids ▁that ▁after ▁death ▁might ▁have ▁covered ▁a ▁larger ▁surface ▁than ▁the ▁org ans ▁they ▁origin ated ▁from , ▁its ▁exact ▁dimensions ▁and ▁extent ▁cannot ▁be ▁determined . ▁In ▁any ▁case ▁a ▁dia ph rag