Hi, Peter. Sorry, I must have misunderstood you. -- Dr Robert Mesibov Honorary Research Associate Queen Victoria Museum and Art Gallery, and School of Zoology, University of Tasmania Home contact: PO Box 101, Penguin, Tasmania, Australia 7316 (03) 64371195; 61 3 64371195 Website: http://www.qvmag.tas.gov.au/mesibov.html