( ( ( incidents , ) ( ( the animal ) ( acted alone ) ) ) . )
(ROOT (NP (NP (NNS incidents)) (, ,) (NP (NP (DT the) (NN animal)) (VP (VBN acted) (ADVP (RB alone)))) (. .)))
incidents, the animal acted alone.
(ROOT (S (NP (PRP We)) (VP (VBP call) (ADVP (DT any) (NN way) (SBAR (IN that) (S (NP (NNS animals)) (VP (VBP act))))) (, ,) (S (UCP (DT either) (ADVP (RB alone)) (CC or) (PP (IN with) (NP (NP (JJ other) (NNS animals)) (, ,) (NP (NN animal) (NN behavior))))))) (. .)))