The Parasite That Makes You King

The video explores the parasitic protozoan Toxoplasma gondii, which can infect various animals, including wolves. While generally harmful, it may benefit wolves by increasing their likelihood of becoming pack leaders. The parasite influences host behavior, making infected animals more prone to risk-taking. A study in Yellowstone showed infected wolves were more likely to disperse and become leaders, despite the risks. Toxoplasma completes its life cycle in cats, with cougars in Yellowstone serving as a primary host. The video also discusses similar effects in other animals, like hyenas and lions.

What is the definitive host for Toxoplasma gondii?

• Birds

• Rodents

• Wolves

• Cats

How does Toxoplasma gondii affect rodents?

• Enhances their vision

• Reduces their fear of cats

• Increases their appetite

• Makes them avoid water

What unusual effect does Toxoplasma have on gray wolves?

• Makes them more likely to become pack leaders

• Causes them to avoid other wolves

• Increases their fear of humans

• Decreases their hunting skills

What was one of the risk-taking behaviors studied in Yellowstone wolves?

• Hunting in groups

• Dispersing from the pack

• Avoiding humans

• Sleeping more

How much more likely were infected wolves to become pack leaders?

• 20 times

• 5 times

• 10 times

• 46 times

What is a potential way wolves might get infected with Toxoplasma in Yellowstone?

• Interacting with humans

• Hunting in packs

• Eating cougar scats

• Drinking contaminated water

What similar behavior was observed in hyenas with Toxoplasma?

• Avoiding lions

• Sleeping less

• Being bolder around lions

• Hunting more frequently