Classification of living things means giving things names so we can talk about them. We are Homo sapiens. Our dog is Canis familiaris. But all is not well in the taxonomic world. This unit studies the methods by which we group living things. Traditionally, we have grouped things by the way they look and behave. Logical? Yes. But that puts crocodiles with lizards when they are more closely related to birds. By introducing you to the classification debates, you are shown the joy of identifying everything from your pets to the trees, from the birds to the bees. Some of you will go on classifying for life.