The downsizer.net has web forum on Foraging. The light discussion is mostly on mushrooms.

http://forum.downsizer.net/forum-26.html

The Biology related discussion forum

http://www.biologyreference.com/forum/

The Equine Behaviour Forum

http://www.gla.ac.uk/external/EBF/

The Forum section of Animal Behaviour contains critiques of published papers relevant to the areas of interest of the journal, and provides an opportunity for constructive exchanges on issues surrounding particular fields of study.

http://www1.elsevier.com/homepage/sap/AnimalBehaviourForum/forum.htm

Cat Behaviour Forum

http://www.animalfriends.org.uk/forums/viewforum.php?f=6&sid=d7d8de3456b6c9195eeb0c55cb3d8341

Horse Behaviour Forum

http://www.tackandtackle.co.uk/forums/viewforum.php?f=2&sid=3c4e334faee3fdd793f3b2c99a169327

Understanding Animals Pet Behaviour Forums

http://www.understandinganimals.com/forum/index.php

AnimalForum.com discuss about fish, cat, horse, reptiles, etc.

http://www.animalforum.com/phpbb/