( Frogs ( ( have ( ( ( three-chambered hearts ) , ) ( ( a feature ) ( they ( share ( with lizards ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Frogs)) (VP (VBP have) (NP (NP (JJ three-chambered) (NNS hearts)) (, ,) (NP (NP (DT a) (NN feature)) (SBAR (S (NP (PRP they)) (VP (VBP share) (PP (IN with) (NP (NNS lizards))))))))) (. .)))
Frogs have three-chambered hearts , a feature they share with lizards .
(ROOT (S (PP (IN Like) (NP (NP (DT all) (NNS tetrapods)) (PP (IN except) (NP (NNS birds) (CC and) (NNS mammals))))) (, ,) (NP (NNS frogs)) (VP (VBP possess) (NP (NP (DT a) (NN heart)) (PP (IN with) (NP (CD three) (NNS chambers))))) (. .)))