This grizzly bear and her cubs are foraging for food. The amount of food is available for them at this particular location will affect their health and behaviour. If there is not enough food, they may move to a different location or change food sources. If they are still not able to find sufficient nutrition, their health may start to deteriorate.

In this lesson you will explore the following question:

• How do limiting factors influence the distribution and range of organisms?
• How do biologists monitor population size?