( and ( ( an animal ) ( communicator . ) ) )
(ROOT (S (CC and) (NP (DT an) (NN animal)) (VP (VBP communicator)) (. .)))
and an animal communicator.
(ROOT (S (PP (IN For) (NP (JJ social) (NNS animals))) (, ,) (NP (NN communication)) (VP (VBZ essential)) (. .)))