Figure 56.3 Food Webs Show Trophic Interactions in a Community This simplified food web for the meadows and forests of Yellowstone National Park includes only some vertebrates and the plants on which they depend. The arrows show trophic interactions and energetic connections. Herbivores whose sole source of food is plants (green arrows) are primary consumers. Carnivores that kill and eat animals (purple arrows) are secondary and tertiary consumers. Omnivores such as grizzly bears, coyotes, and ravens eat both plant and animal tissues; ravens and grizzlies also eat carrion (dashed purple arrows), so these species are also scavengers.