(S (S (NP (BASENP (DT All) (JJ previous) (NNS attempts)) (PP (IN at) (S (VP (VBG moving) (BASENP (NNS bats)))))) (VP (VBP have) (VP (VBN failed) (PP (JJ due) (PP (TO to) (BASENP (PRPD their) (JJ natural) (NN homing) (NNS instincts))))))) (PERIOD .))