Bison Migration in Yellowstone

In spring, meltwater from a vast area drains into the Yellowstone River, causing streams to swell. Bison begin their migration to higher ground, crossing swollen rivers with their calves. The journey is perilous, as calves struggle against strong currents. Maternal instincts drive cows to shield their young, ensuring their survival as the herd continues to higher pastures in Yellowstone.

What natural event triggers the bison migration in Yellowstone?

• The migration of birds

• The melting of snow and ice

• The change in daylight hours

• The arrival of spring flowers

Why do bison calves stay close to their mothers during migration?

• To navigate dangerous waters

• To stay warm

• To avoid predators

• To learn the migration route

What challenge do bison face when crossing rivers during migration?

• Strong currents

• Lack of food

• Steep riverbanks

• Cold temperatures

How does a mother bison help her calf during the river crossing?

• By carrying it on her back

• By using her body to shield it from the current

• By teaching it to swim

• By finding a shallow crossing

What is the ultimate destination for the bison herd after crossing the rivers?

• The edge of the forest

• The heart of Yellowstone

• The open plains

• The base of the mountains

What is the primary reason for the bison's migration to higher pastures?

• To avoid human activity

• To access better grazing areas

• To escape predators

• To find new mates