Below are a couple of quotes from the Tweeters Guidelines:

"Discussion of ecology, and of wild critters other than birds, is
acceptable, indeed encouraged. "

"Not all topics are of interest to all subscribers. The subject line is the
main guide to weeding out posts."

Tweeters has a remarkably broad charter. An occasional rereading of the
Guidelines helps refresh the memory:

http://www.scn.org/earth/tweeters/guidelines.html

Hal Opperman
Medina, WA
hal at catharus.net