( However ( , ( ( ( certain groups ) ( of ( animals ( -LRB- ( ( most notably ) ( ( ( birds and ) fish ) -RRB- ) ) ) ) ) ) ( ( appear ( to ( be ( ( as broadly ) ( ( affected ( as plants ) ) ( by ( alien species ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB However)) (, ,) (NP (NP (JJ certain) (NNS groups)) (PP (IN of) (NP (NP (NNS animals)) (PRN (-LRB- -LRB-) (ADVP (RBS most) (RB notably)) (NP (NP (NNS birds)) (CC and) (NP (NN fish))) (-RRB- -RRB-))))) (VP (VBP appear) (S (VP (TO to) (VP (VB be) (VP (ADVP (RB as) (RB broadly)) (VBN affected) (PP (IN as) (NP (NNS plants))) (PP (IN by) (NP (JJ alien) (NNS species)))))))) (. .)))
However, certain groups of animals (most notably birds and fish) appear to be as broadly affected as plants by alien 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))))) (. .)))