( ( When ( not ( in use ) ) ) ( , ( ( the tongue ) ( ( ( rests ( in ( ( thoracic cavity ) ( at ( its base ) ) ) ) ) ( amid ( ( ( the ( ( heart and ) sternum ) ) , ) ( which ( is ( more ( likely ( to ( be ( ( a structure ) ( of ( ant-eating pangolins ) ) ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (WHADVP (WRB When)) (FRAG (PP (RB not) (IN in) (NP (NN use))))) (, ,) (NP (DT the) (NN tongue)) (VP (VBZ rests) (PP (IN in) (NP (NP (JJ thoracic) (NN cavity)) (PP (IN at) (NP (PRP$ its) (NN base))))) (PP (IN amid) (NP (NP (DT the) (NN heart) (CC and) (NN sternum)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (ADJP (RBR more) (JJ likely) (S (VP (TO to) (VP (VB be) (NP (NP (DT a) (NN structure)) (PP (IN of) (NP (JJ ant-eating) (NNS pangolins)))))))))))))) (. .)))
When not in use, the tongue rests in thoracic cavity at its base amid the heart and sternum, which is more likely to be a structure of ant-eating pangolins.
(ROOT (S (NP (DT The) (NN sternum)) (VP (VBZ is) (NP (NP (DT the) (NN name)) (PP (IN of) (NP (NP (DT the) (JJ elongated) (NN bony) (NN structure)) (SBAR (WHNP (WDT that)) (S (VP (VBZ anchors) (NP (DT the) (JJ anterior) (JJ thoracic) (NN cage))))))))) (. .)))