The agriculture industry is responsible for producing a variety of products. By-products are a secondary product created when an initial product is produced. Virtually every part of an animal or plant is put to good use. This lesson discovers the differences between products and by-products and showcases how relevant agriculture is in daily life. Objectives: Define the term by-product. Identify products made from animals. Recognize the importance of by-products. Determine the circumference, area or volume of agricultural by-products. Time: Activity 1: 15-20 minutes Activity 2: 30-40 minutes Activity 3: 30-45 minutes