Reference Books for Natural Animal Care

I am looking for a good source of natural animal care information (especially natural first aid) for all of my pets (cats, rabbits, chickens, and ducks). Are there any books, websites, etc you would recommend?

Please see the work of Richard Pitcairn, "Natural Health for Dogs and Cats" as well as "The Complete Herbal Handbook for the Dog and Cat", "Cats Naturally" and "The Complete Herbal Handbook for Farm and Stable" by Juliette de Bairacli Levy.