( Herbivores ( ( are ( animals ( that ( eat ( only plants ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Herbivores)) (VP (VBP are) (NP (NP (NNS animals)) (SBAR (WHNP (WDT that)) (S (VP (VBP eat) (NP (JJ only) (NNS plants))))))) (. .)))
Herbivores are animals that eat only plants.
(ROOT (S (NP (NNS Herbivores)) (VP (VBP are) (NP (NP (NNS heterotrophs)) (SBAR (WHNP (WDT that)) (S (VP (VBP eat) (NP (UCP (ADJP (JJ only)) (CC or) (ADVP (RB mainly))) (NNS plants))))))) (. .)))