Different Beaver Factions

I have a few ideas for the beavers:

1. While beavers are certainly a "western species", there's no reason for them to not develop a more Asian aesthetic after the fall of humanity. Imagine beavers building Japanese-styled homes on stilts.

2. A beaver faction that do not need dynamite to dig up canals or tear down cliffs but they consume more water and food to survive. They can build underground housing and storage which consume less logs, can be build over and still have a soil layer for growing crops and even trees.

3. Beavers that build structures that can function while flooded or underwater. Even it the buildings are mere housing and storage, it can still lead to a number of gameplay options.

4. Beavers that specialise in growing trees by making them grow faster.

5. Beavers that can build flying machines (basically hot air balloons) to easily travel over cliffs at the cost of logs. However, the balloons need metal to be built and require "landing pads" to land on.