( ( ( ( Nearly 250 ) species ) ( of ( amphibians ( , ( birds ( , ( and mammals ) ) ) ) ) ) ) ( ( have ( ( become ( ( extinct due ) ( to ( ( the result ) ( of ( human activity ) ) ) ) ) ) ( in ( the ( past ( 400 years ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (QP (RB Nearly) (CD 250)) (NNS species)) (PP (IN of) (NP (NNS amphibians) (, ,) (NNS birds) (, ,) (CC and) (NNS mammals)))) (VP (VBP have) (VP (VBN become) (ADJP (ADJP (JJ extinct) (JJ due)) (PP (TO to) (NP (NP (DT the) (NN result)) (PP (IN of) (NP (JJ human) (NN activity)))))) (PP (IN in) (NP (DT the) (JJ past) (CD 400) (NNS years))))) (. .)))
Nearly 250 species of amphibians, birds, and mammals have become extinct due to the result of human activity in the past 400 years.
(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))))) (. .)))