(S (S (BASENP (DT The) (NNS animals)) (VP (VBD tended) (S (VP (TO to) (VP (VB face) (NP (NP (BASENP (NN north-south)) (ADJP (JJ oriented))) (PP (IN toward) (NP (BASENP (DT the) (NN earth) (POS 's)) (BASENP (JJ magnetic) (NNS poles)))))))))) (PERIOD .))