Here's why:
* Tundra climate: The tundra is characterized by extremely cold temperatures, permafrost (permanently frozen ground), and limited vegetation.
* Beaver needs: Beavers require a warmer climate, access to water, and plenty of trees for building dams and lodges. The harsh conditions of the tundra make it impossible for them to survive.
* Habitat: Beavers are typically found in forests and wetlands with access to rivers and streams, environments that are much warmer and more conducive to their needs.
Therefore, beavers are not found in the tundra biome.