TED-Ed: Why do beavers build dams? | Glynnis Hood

The video explores the construction and ecological impact of beaver dams, highlighting the world's longest beaver dam visible from space. It details how beavers select sites, build and maintain dams, and regulate water flow. The video also covers beaver family dynamics, territory expansion, and the benefits of beaver dams for both wildlife and humans, such as increased biodiversity and flood control.

What is the primary reason the world's longest beaver dam is significant?

• It is located in a desert.

• It is made entirely of mud.

• It can be seen from space.

• It is the largest structure built by any animal.

What is a key factor beavers consider when choosing a site for their dam?

• The availability of fish

• The proximity to human settlements

• The depth and steepness of the stream

• The presence of predators

How do beavers reinforce areas of their dams where water flows the strongest?

• By using larger rocks

• By adding more mud

• By planting trees

• By digging deeper channels

What is a significant benefit of beaver dams for surrounding wildlife?

• They reduce the number of predators.

• They increase the temperature of the water.

• They create nesting sites and refuges.

• They provide a source of food.

How do beaver ponds benefit humans?

• By increasing fish populations

• By replenishing groundwater stores

• By reducing air pollution

• By providing recreational areas