( ( Small mammals ) ( ( may ( have ( ( a ( large impact ) ) ( on cocoons ) ) ) ) . ) )
(ROOT (S (NP (JJ Small) (NNS mammals)) (VP (MD may) (VP (VB have) (NP (NP (DT a) (JJ large) (NN impact)) (PP (IN on) (NP (NNS cocoons)))))) (. .)))
Small mammals may have a large impact on cocoons.
(ROOT (S (NP (JJ Placental) (NNS mammals)) (VP (VBP give) (NP (NN birth)) (PP (TO to) (NP (ADJP (RB relatively) (JJ large)) (NNS fetuses)))) (. .)))