( ( of ( large mammals ) ) . )
(ROOT (FRAG (PP (IN of) (NP (JJ large) (NNS mammals))) (. .)))
of large mammals.
(ROOT (S (NP (JJ Placental) (NNS mammals)) (VP (VBP give) (NP (NN birth)) (PP (TO to) (NP (ADJP (RB relatively) (JJ large)) (NNS fetuses)))) (. .)))