Question

Which food sources scarcity caused the Yellowstone National Park beaver population to decrease
Fish
Grass
Willow
Otter

Answer 1

The scarcity of **willow** is primarily responsible for the decrease in the beaver population in Yellowstone National Park. Beavers rely heavily on willow as a food source and for building their dams. When the availability of willow decreases, it negatively impacts their survival and population levels.