Why are key stone species important in food webs? What roles do grizzly bears, whitepark pines, and squirrels play in the Crown of the Continent food web? Objective Students will understand the complexities of a segment of the food web that involves grizzly bears, whitebark pines, and squirrels. Background This is a game illustrating opportunistic grizzly bear feeding. Bears follow a seasonal cycle of food-gathering, changing foods as different plants become ripe or as other foods become available in other ways. This game takes a fair amount of preparation, but it is worth it! Your students wi Duration: 90 Minutes Additional Standards: NGSS MS-LS2-1. Analyze & interpret data to provide evidence for the effects of resource availability on organisms & populations of organisms in an ecosystem. MS-LS2-3 Develop a model to describe the cycling of matter and flow of energy among an ecosystem Essential Qu.