( ( ( Homosexual behavior ) ( in ( other animals ) ) ) . )
(ROOT (NP (NP (JJ Homosexual) (NN behavior)) (PP (IN in) (NP (JJ other) (NNS animals))) (. .)))
Homosexual behavior in other animals.
(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))))))) (. .)))