Why were wolves absent from Yellowstone from the 1920's to 1995?

• There was no prey available, so they starved.

• When all the elk died, the wolves moved to Canada.

• Humans hunted and killed all the wolves in Yellowstone and the surrounding area.

• The wolves migrated south to Texas for a warmer climate.

Wolves and elk sometimes hunt together for the same prey.

• True

• False

Why was the songbird population reduced by the presence of too many elk in Yellowstone?

• Elk ate young trees, so birds had fewer places to nest.

• Elk ate too many songbirds.

• Wolves at songbirds when no elk were available.

Other species that feed from an elk killed by wolves include

• foxes, rabbits, and mice

• bears, foxes, and beavers

• bears, eagles, and coyotes

• beavers, rabbits, and mice

How long were the wolves absent from Yellowstone National Park?

• 1 year

• 5 years

• 10 years

• 70 years

Explain why the population of elk built up.

• There were just a lot of them and so they reproduced quickly.

• There was lots of food for the elk in the park so they reproduced well.

• There was no natural predator to hunt them so they became over populated.

• No one is actually sure why this happened.

What happened to the vegetation because of the elk population?

• The elk ate it all, They reduced the vegetation to almost nothing, or they devoured it, leaving it bare.

• Nothing at all. the vegetation just grew as normal.

• A drought actually caused the vegetation to die and the elk trampled what was left.

• The elk ate some of it but lots of the vegetation remained.

Why did the height of trees grow dramatically?

• The weather had been much better and the trees grew taller.

• The trees did not grow dramatically. Everything stayed the same.

• The elk was not there to eat it, and now it can grow.

Song birds & migratory birds returned because...

• They come back in the spring every year as normal.

• They came to find shelter in trees, as there were more and taller trees.

• They liked to follow the wolves and eat their left overs.

• As the weather was much better, they enjoyed the park more.

Beavers returned because...

• There were more trees. They like to build dams and eat trees. They build many habitats and niches for other animals

• They liked the warmer temperatures in the park because of climate change.

• They are carnivores and will eat the wolves.

• They are carnivores and will eat the elk.