The Impact of Wolves on Yellowstone's Ecosystem

What is a trophic cascade?

• A type of waterfall

• An ecological process affecting food chains

• A type of forest in Yellowstone

• A method of controlling animal populations

Why were wolves reintroduced to Yellowstone?

• To increase the deer population

• To control the deer population

• To increase the wolf population

• For tourist attraction

How did the deer change their behavior after wolves were reintroduced?

• They avoided certain areas

• They became faster

• They became nocturnal

• They started migrating

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What happened to the vegetation in areas avoided by deer?

• It remained the same

• It was destroyed by bears

• It turned into desert

• It started to regenerate

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Which animal's population increased because they like to eat trees?

• Wolves

• Beavers

• Bears

• Deer

What role do beavers play in the ecosystem?

• Predators of fish

• Scavengers

• Herbivores

• Ecosystem engineers

What effect did wolves have on the coyote population?

• It increased

• It decreased

• Coyotes became friendlier

• It stayed the same

Which birds came down to feed on the carrion left by wolves?

• Ravens and bald eagles

• Ducks and geese

• Pigeons and sparrows

• Hawks and owls

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How did the presence of wolves affect the rivers in Yellowstone?

• The rivers dried up

• The rivers meandered less

• The rivers became saltier

• There was more erosion

Why did the rivers change after wolves were reintroduced?

• Wolves dug new river paths

• Because of increased fish activity

• Due to direct drinking by wolves

• Due to stabilized river banks by vegetation