Understanding Invasive Species

The video explores the concept of invasive species, using starlings in North America as a case study. Initially absent from the US, starlings were introduced and thrived, outcompeting native birds for resources. The video also discusses accidental introductions, like the brown tree snake in Guam, and highlights prevention strategies to control invasive species spread.

What is a notable characteristic of starling flocks?

• They fly in small groups.

• They do not fly at all.

• They are always solitary.

• They form very large flocks.

What defines an invasive species?

• A species that causes harm in a new environment.

• A species that is native to a region.

• A species that cannot survive outside its native habitat.

• A species that is beneficial to its new environment.

Why were starlings able to thrive in North America?

• They had no natural predators.

• They were larger than native birds.

• They could find food all year round.

• They were protected by law.

How did the introduction of starlings affect native birds?

• Native birds became predators of starlings.

• Native birds lost food and nesting sites.

• Native birds were unaffected.

• Native birds had more food.

How did the brown tree snake arrive in Guam?

• It was accidentally transported by humans.

• It swam across the ocean.

• It flew there on its own.

• It was intentionally introduced.

What was a consequence of the brown tree snake's introduction to Guam?

• Introduction of new predators.

• Increase in bird populations.

• Decrease in snake populations.

• Extinction of some native bird species.

What is one method used to prevent the spread of invasive species?

• Training dogs to detect them.

• Introducing more invasive species.

• Ignoring the problem.

• Encouraging their spread.

Why is it important to be cautious with wildlife?

• To make them extinct.

• To ensure they become invasive.

• To prevent them from becoming invasive.

• To increase their population.

What lesson can be learned from the story of starlings in North America?

• Invasive species do not affect native species.

• Invasive species are easy to control.

• Invasive species can have negative impacts.

• Invasive species always benefit the environment.

What is a general strategy to stop invasive species?

• Encouraging their growth.

• Relocating them to new areas.

• Ignoring their presence.

• Being careful not to introduce them.