( ( As ( ( ( ( threats ( to ( bird populations ) ) ) grow ) and ) ( extinctions continue ) ) ) ( , ( ( historical specimens ) ( ( are ( valuable ( in ( ( documenting ( ( the impacts ) ( of ( ( human ( ( activities and ) causes ) ) ( of decline ) ) ) ) ) ( for ( threatened species ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN As) (S (S (NP (NP (NNS threats)) (PP (TO to) (NP (NN bird) (NNS populations)))) (VP (VBP grow))) (CC and) (S (NP (NNS extinctions)) (VP (VBP continue))))) (, ,) (NP (JJ historical) (NNS specimens)) (VP (VBP are) (ADJP (JJ valuable) (PP (IN in) (S (VP (VBG documenting) (NP (NP (DT the) (NNS impacts)) (PP (IN of) (NP (NP (JJ human) (NNS activities) (CC and) (NNS causes)) (PP (IN of) (NP (NN decline)))))) (PP (IN for) (NP (VBN threatened) (NNS species)))))))) (. .)))
As threats to bird populations grow and extinctions continue, historical specimens are valuable in documenting the impacts of human activities and causes of decline for threatened species.
(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))))) (. .)))