National Public Radio officials are blaming 'inadequate listener support' for the low ratings plaguing the two-month-old NPR Morning Zoo Crew Show. 'For some reason, radio listeners have not responded to the zany antics of NPR Zookeepers Alex Chadwick, Jean Cochran and Bob Edwards, whose outrageous pranks have included phoning Harper's editor Lewis Lapham at 6 a.m. and telling him that there's a new collection of Nicholson Baker short stories due out in the fall,' NPR programming director James Orbach said. 'Then there was the time the Zookeepers actually had Saul Bellow convinced that he'd won the Booker Prize.' The NPR Zoo Crew has also gained notoriety for its wacky song parodies, such as a reworked 'Prelude In C-Sharp Minor' by Rachmaninoff with lyrics spoofing Noam Chomsky's recent speech before the National Book Club. 