In the 25th year of the BBC Natural History Unit. the second half of a series in 26 parts. Narrator David Attenborough
18: Raspers and Scrapers Using sophisticated recording equipment, researchers have discovered that a multitude of hard-bodied invertebrates communicate with sound. John Mercer of University College. Galway,
Ken Norris of the University of California at Santa Cruz. David Pye of University College,
London, and George Uetz , of the University of Cincinnati, eavesdrop on the underwater conversations of spiny lobsters, ghost crabs, snapping shrimps and caddis fly larvae, and the ' love-calls ' of spiders. Written and produced by MICHAEL BRIGHT BBC Bristol