***** To join INSNA, visit http://www.sfu.ca/~insna/ ***** He has links to related material. I found the one about "Giant Pacific Octopus/ (octopus dofleini)/ to be especially interesting, perhaps because this material, including the wonderful photographs, were done in the waters around Vancouver, British Columbia. You can see how vacancy chains work if you study them. Here's the URL: http://dive.bc.ca/pictures/octo/octo.html _____________________________________________________________________ SOCNET is a service of INSNA, the professional association for social network researchers (http://www.sfu.ca/~insna/). To unsubscribe, send an email message to [log in to unmask] containing the line UNSUBSCRIBE SOCNET in the body of the message.