( ( b -RRB- ) ( herbivore ( , ( carnivore ( , ( omnivore ; ) ) ) ) ) )
(ROOT (S (LST (LS b) (-RRB- -RRB-)) (NP (NN herbivore)) (, ,) (ADVP (RB carnivore)) (, ,) (VP (VBP omnivore)) (: ;)))
b) herbivore, carnivore, omnivore;
(ROOT (S (NP (NNS Mammals)) (VP (MD may) (RB either) (VP (VB be) (NP (NNS herbivores) (, ,) (NNS omnivores) (CC or) (NNS herbivores)))) (. .)))