( They ( ( ( ( ( ( ( ( are ( ( ( species ( of ( the understory ) ) ) and ) ( edges ( of forests ) ) ) ) , ) ( mostly ( in mountains ) ) ) , ) and ) ( often near ) ) streams ) . ) )
(ROOT (S (NP (PRP They)) (VP (VP (VBP are) (NP (NP (NP (NNS species)) (PP (IN of) (NP (DT the) (NN understory)))) (CC and) (NP (NP (NNS edges)) (PP (IN of) (NP (NNS forests)))))) (, ,) (VP (ADVP (RB mostly)) (PP (IN in) (NP (NNS mountains)))) (, ,) (CC and) (ADVP (RB often) (RB near)) (VP (VBZ streams))) (. .)))
They are species of the understory and edges of forests, mostly in mountains, and often near streams.
(ROOT (S (NP (NNS Streams)) (ADVP (RB often)) (VP (VBP start) (PP (IN in) (NP (NNS mountains)))) (. .)))