( ( As ( ( a result ) ( of ( their activity ) ) ) ) ( , ( ( ( 35 species ) ( of birds ) ) ( ( became extinct ) . ) ) ) )
(ROOT (S (PP (IN As) (NP (NP (DT a) (NN result)) (PP (IN of) (NP (PRP$ their) (NN activity))))) (, ,) (NP (NP (CD 35) (NNS species)) (PP (IN of) (NP (NNS birds)))) (VP (VBD became) (ADJP (JJ extinct))) (. .)))
As a result of their activity, 35 species of birds became extinct.
(ROOT (S (PP (IN Around) (NP (CD 1200))) (NP (NP (NNS species)) (PP (IN of) (NP (NNS birds)))) (VP (VBP are) (ADVP (ADVP (RB currently)) (PP (IN at) (NP (NP (NN risk)) (PP (IN of) (NP (NN extinction)))))) (ADJP (JJ due) (PP (TO to) (NP (JJ human) (NN activity))))) (. .)))