I use this slideshow with my second graders. It provides a quick review of herbivores, carnivores, and omnivores. Pictures of each are included. Food chains are described in a simple way that first, second, or third graders can understand easily. You will find a short (oral) quiz at the end of the slideshow. The quiz helps you determine if your students grasp the information or not. After using this presentation, I ask my students to illustrate their own food chain.