Years of coevolution between plants and herbivores have resulted in a diverse array of plant defenses and herbivore counter\|defense. Tannins, a diverse group of polar, high molecular weight, found in many vascular plants (especially woody perennials), are characterized by their ability to precipitate proteins. Plant tannins affect many aspects of the consumer's digestion and metabolism, such as feed intake, dietary protein availability, activity of digestive enzyme, detoxification activity, postabsorptive...