(S (S (BASENP (PRP It)) (VP (VP (VP (VBD took) (BASENP (NNS investigators))) (BASENP (NN two) (NNS weeks))) (S (VP (TO to) (VP (ADVP (RB positively)) (VP (VP (VB identify) (BASENP (DT the) (JJ toothy) (NN crocodile))) (PP (IN as) (NP (BASENP (DT an) (JJ American) (NN alligator)) (COMMA ,) (PRN (LRB -LRB-) (BASENP (NNP Alligator) (NN mississippiensis)) (RRB -RRB-)))))))))) (PERIOD .))