Often classified as a whole grain, amaranth is actually a seed. It is lumped in with cereal grains due to its similar nutrient profile. Amaranth is about 13% protein, coming in right behind quinoa at 15%. The texture of amaranth is much coarser and is best as an add-in with other grains to make it easier on the palate.
Fun fact: You can pop amaranth in a dry sauté pan over high heat. Add the tiny popped seeds to cereal, a salad, or granola for extra protein punch.