Thanks for the invite. Someone mentioned the Catholic Concern for Animals group, I would like to add the Oxford Centre for Animal Ethics as a resource.
http://www.oxfordanimalethics.com/index.php?p=director
Andrew Linzey has written several books about animal theology. I hope he's right, in that this is a new and growing branch of theology. Long it may it grow. p.s. yes, he's an Anglican.
Here's a taste of his writings;
http://www.oxfordanimalethics.com/index.php?p=comment