The omega-3 fatty acids are a key nutrient in cognition for felines. They are essential for felines as they cannot be synthesized naturally and must be obtained from the diet.[42] Omega-3 fatty acids that support brain development and function are alpha-linolenic acid, docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA).[42] Fish oils, fish and other marine sources provide a very rich source of DHA and EPA.[42] Alpha-linolenic acid can be acquired from oils and seeds.[42]