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🐺 Wolves and the packs that reshaped Yellowstone

Trace Yellowstone's wolves from eradication to reintroduction, then follow the evidence through packs, elk, scavengers, willows, beavers, and an ecosystem still under study.

4
lessons
~30 min
to learn
Adults
level
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What you’ll learn

  1. A predator disappearsExplain how policy-driven wolf removal changed Yellowstone's food web before restoration.Predator control removed wolves and left elk, vegetation, and scavenger relationships in a different ecological context.
  2. The return of the packsDescribe the 1995-96 reintroduction and how wolf packs organize recovery across space and time.Fourteen wolves arrived in 1995 and seventeen more in 1996; family packs, territories, dispersal, and prey shaped the recovery.
  3. A food web ripplesTrace wolf effects through elk, scavengers, willows, beavers, and wetlands without reducing the system to one cause.Predation and risk can alter prey behavior and carrion supply, while vegetation and wetland responses depend on many interacting forces.
  4. What changed, and what remains uncertainEvaluate the evidence for Yellowstone's trophic cascade and distinguish strong findings from debated mechanisms.Wolf recovery clearly changed predator-prey and scavenger relationships, while the size and pathway of vegetation recovery remain uneven and under study.

Questions this course answers

Why were wolves absent from Yellowstone by the 1920s?

Wolf removal was a management choice aimed at protecting livestock and increasing populations of favored game animals.

What does a trophic cascade describe in this course?

Predator effects can travel through prey, scavengers, plants, and habitat, although the strength of each link varies.

Why is the simple 'wolves changed the rivers' story incomplete?

NPS reviews and research describe a real but uneven and debated set of pathways rather than one universal chain.

What is one important role of a wolf kill besides feeding the pack?

Carcasses are shared, contested, and decomposed by a wider scavenger community, linking wolves to many other species.

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