( ( These ( small rails ) ) ( ( ( ( are ( ( half ( the size ) ) ( of ( the ( common blackbird ) ) ) ) ) but ) ( have ( spectacular plumage ) ) ) . ) )
(ROOT (S (NP (DT These) (JJ small) (NNS rails)) (VP (VP (VBP are) (NP (NP (PDT half) (DT the) (NN size)) (PP (IN of) (NP (DT the) (JJ common) (NN blackbird))))) (CC but) (VP (VBP have) (NP (JJ spectacular) (NN plumage)))) (. .)))
These small rails are half the size of the common blackbird but have spectacular plumage.
(ROOT (S (NP (DT All) (NNS cells)) (VP (VBP have) (NP (NP (DT the) (JJ small) (NN size)) (PP (IN in) (NP (JJ common))))) (. .)))