( ( Although ( there ( has ( been ( ( ( ( little investigation ) ( on ( the ( specific circulatory ) ) ) ) and ) ( ( cardiovascular system ) ( of flamingos ) ) ) ) ) ) ) ( , ( they ( ( possess ( ( the ( typical features ) ) ( of ( an ( avian ( circulatory system ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN Although) (S (NP (EX there)) (VP (VBZ has) (VP (VBN been) (NP (NP (NP (JJ little) (NN investigation)) (PP (IN on) (NP (DT the) (JJ specific) (NN circulatory)))) (CC and) (NP (NP (JJ cardiovascular) (NN system)) (PP (IN of) (NP (NNS flamingos))))))))) (, ,) (NP (PRP they)) (VP (VBP possess) (NP (NP (DT the) (JJ typical) (NNS features)) (PP (IN of) (NP (DT an) (NN avian) (NN circulatory) (NN system))))) (. .)))
Although there has been little investigation on the specific circulatory and cardiovascular system of flamingos, they possess the typical features of an avian circulatory system.
(ROOT (S (NP (NNS Echinoderms)) (VP (VBP possess) (NP (DT a) (JJ water-based) (NN circulatory) (NN system))) (. .)))