( ( ( ( ( ( ( ( ( ( ( ( They ( ( ( have ( a ( bony endoskele ) ) ) - ) ( ton ( with ( ( a backbone ) ( but ( no jaws ) ) ) ) ) ) ) ; ) ( they ( ( breathe only ) ( with lungs ) ) ) ) ; ) ( they ( ( ( have ( four limbs ) ) , ) ( with ( ( the ( two ( front limbs ) ) ) ( modified ( as wings ) ) ) ) ) ) ) ; ) ( ( their skin ) ( is ( covered ( with feathers ) ) ) ) ) ; ) ( they ( have ( amniotic eggs ) ) ) ) ; ) ( they ( are endothermic ) ) ) . )
(ROOT (S (S (NP (PRP They)) (VP (VP (VBP have) (NP (DT a) (JJ bony) (NN endoskele))) (: -) (NP (NP (NN ton)) (PP (IN with) (NP (NP (DT a) (NN backbone)) (PP (CC but) (NP (DT no) (NNS jaws)))))))) (: ;) (S (NP (PRP they)) (VP (VB breathe) (ADVP (RB only)) (PP (IN with) (NP (NNS lungs))))) (: ;) (S (NP (PRP they)) (VP (VBP have) (NP (CD four) (NNS limbs)) (, ,) (PP (IN with) (NP (NP (DT the) (CD two) (JJ front) (NNS limbs)) (VP (VBN modified) (PP (IN as) (NP (NNS wings)))))))) (: ;) (S (NP (PRP$ their) (NN skin)) (VP (VBZ is) (VP (VBN covered) (PP (IN with) (NP (NNS feathers)))))) (: ;) (S (NP (PRP they)) (VP (VBP have) (NP (JJ amniotic) (NNS eggs)))) (: ;) (S (NP (PRP they)) (VP (VBP are) (ADJP (JJ endothermic)))) (. .)))
They have a bony endoskele-  ton with a backbone but no  jaws; they breathe only with  lungs; they have four limbs, with  the two front limbs modified  as wings; their skin is covered  with feathers; they have amniotic  eggs; they are endothermic.
(ROOT (S (NP (NNS Mammals)) (VP (VP (VBP have) (NP (CD four) (NNS limbs))) (CC and) (VP (VBP produce) (NP (JJ amniotic) (NNS eggs)))) (. .)))