( ( Since ( the 1600s ) ) ( ( ( ( ( at least ) 115 ) species ) ( of bird ) ) ( ( are ( ( ( known ( to ( have ( gone extinct ) ) ) ) , ) ( mostly ( as ( ( a result ) ( of ( ( human interference ) ( of ( ( ( one sort ) or ) another ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (PP (IN Since) (NP (DT the) (NNS 1600s))) (NP (NP (QP (IN at) (JJS least) (CD 115)) (NNS species)) (PP (IN of) (NP (NN bird)))) (VP (VBP are) (VP (VBN known) (S (VP (TO to) (VP (VB have) (VP (VBN gone) (S (ADJP (JJ extinct))))))) (, ,) (PP (RB mostly) (IN as) (NP (NP (DT a) (NN result)) (PP (IN of) (NP (NP (JJ human) (NN interference)) (PP (IN of) (NP (NP (CD one) (NN sort)) (CC or) (NP (DT another)))))))))) (. .)))
Since the 1600s at least 115 species of bird are known to have gone extinct, mostly as a result of human interference of one sort or another.
(ROOT (S (NP (NNP Human) (NNS actions)) (VP (VBZ is) (ADJP (JJ responsible) (PP (IN for) (NP (NP (DT the) (NN extinction)) (PP (IN of) (NP (NP (NNS hundreds)) (PP (IN of) (NP (NP (NNS species)) (PP (IN of) (NP (NNS birds))))))))))) (. .)))