(S (S (S (BASENP (NNS Whales)) (VP (VBP are) (VP (ADVP (RB frequently)) (VP (VP (VBN stranded) (PP (IN on) (NP (BASENP (DT the) (NNS beaches)) (PP (IN of) (BASENP (NNP New) (NNP Zealand)))))) (BASENP (DT each) (NN summer)))))) (COMMA ,) (SBAR (IN as) (S (BASENP (PRP they)) (VP (VBP travel) (ADVP (ADVP (FW en) (FW route)) (PP (PP (IN from) (BASENP (NNP Antarctica))) (PP (TO to) (BASENP (NN breeding) (NNS grounds))))))))) (PERIOD .))